Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Intangible-related deferred taxes Deferred Income Tax Expense Related to Intangibles The component of income tax expense for the period representing the tax effect of the difference between amortization of intangibles for book purposes and amortization of intangibles for tax purposes. State Current State and Local Tax Expense (Benefit) Units vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Consolidated Entities [Axis] Consolidated Entities [Axis] Derivative assets, gross Derivative Asset, Not Subject to Master Netting Arrangement Schedule of Carrying Value and Principal Amount at Maturity of Junior Convertible Securities Schedule of Convertible Securities [Table Text Block] Tabular disclosure of the carrying amount and fair value of convertible securities. Affiliate Equity Affiliate Equity -- None. No documentation exists for this element. -- Derivative financial instruments Derivative Liability Dividends Dividends, Common Stock, Cash Security Exchange Name Security Exchange Name Units forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Options forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period NAV of investments at fair value Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] Weighted average remaining lease term - operating leases Operating Lease, Weighted Average Remaining Lease Term Foreign Currency Translation Foreign Currency Transactions and Translations Policy [Policy Text Block] Performance condition changes (in shares) Share-Based Compensation Arrangement By Share-based Payment Award, Options, Period Increase (Decrease), Performance Condition Changes Share-Based Compensation Arrangement By Share-based Payment Award, Options, Period Increase (Decrease), Performance Condition Changes Unrealized gains Marketable Securities, Unrealized Gains Marketable Securities, Unrealized Gains Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Derivative Financial Instruments Derivatives, Policy [Policy Text Block] Shares available for future grant (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Net (decrease) increase in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Intangible asset amortization Deferred Tax Liabilities, Intangible Assets Intrinsic value of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Depreciation and other amortization Depreciation and Other Amortization The aggregate expense charged against earnings to allocate the cost of tangible assets to periods in which the assets are used and held and to allocate the cost of issuing debt to periods in which the debt is outstanding. As a noncash expense, this element is added back to net income when calculating cash provided by (used in) operations using the indirect method. Additions Charged to Costs and Expenses SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense Foreign currency translation gain (loss) Foreign Currency Translation Adjustment Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member] Other Investments [Roll Forward] Other Investments [Roll Forward] Other Investments Subsequent Event Type [Domain] Subsequent Event Type [Domain] Purchases Noncontrolling Interest, Increase (Decrease) from Purchase of Interests Noncontrolling Interest, Increase (Decrease) from Purchase of Interests Amortization and impairment expenses of intangible assets Intangible amortization and impairments Intangible amortization expense Amortization of Intangible Assets Other comprehensive income (loss), net of tax: Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Additions based on prior years’ tax positions Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Cash collateral held from counterparty Derivative, Collateral, Obligation to Return Cash Antidilutive securities excluded from computation of earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Weighted average discount rate - operating leases Operating Lease, Weighted Average Discount Rate, Percent Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table] Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table] Deferred tax assets, net of valuation allowance Deferred Tax Assets, Net of Valuation Allowance Controlling Interest Unrecognized Compensation Expenses Related to Affiliate Equity Attributable to Controlling Interest Unrecognized Compensation Expenses Related to Affiliate Equity Attributable to Controlling Interest Business Combination and Asset Acquisition [Abstract] Business Acquisition [Axis] Business Acquisition [Axis] Cash Flow Hedging Cash Flow Hedging [Member] Junior Convertible Trust Preferred Securities Junior Convertible Trust Preferred Securities [Member] Represents the junior convertible trust preferred securities. Operating Loss Carryforward SEC Schedule, 12-09, Valuation Allowance, Operating Loss Carryforward [Member] Award Type [Domain] Award Type [Domain] Local Phone Number Local Phone Number Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] Stock Options, Exercisable at the end of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Investments in and Advances to Affiliates [Table] Investments in and Advances to Affiliates [Table] Acquired Client Relationships and Goodwill Goodwill and Intangible Assets, Policy [Policy Text Block] Net investments Finite-lived Intangible Assets Acquired Distributions to non-controlling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Retained Earnings Retained Earnings [Member] Affiliate Equity Purchase Obligations Affiliate equity purchase obligations Obligations to Related Parties [Member] Represents the obligations of the entity towards related parties. Right-of-use assets Deferred Tax Liabilities, Leasing Arrangements Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Distributions of earnings received from equity method investments Distributions of earnings Proceeds from Equity Method Investment, Distribution Parnassus Parnassus Investments [Member] Parnassus Investments Investments, All Other Investments [Abstract] Investments, All Other Investments [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Stock repurchase plan, number of remaining shares to be repurchased (in shares) Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Undisclosed Affiliate Undisclosed Affiliate [Member] Undisclosed Affiliate Tax Period [Domain] Tax Period [Domain] Fair Value, Assets and Liabilities, Measured on Recurring Basis Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fixed interest rate Derivative, Fixed Interest Rate Without Readily Determinable Fair Values Equity Securities Without Readily Determinable Fair Value [Roll Forward] Equity Securities Without Readily Determinable Fair Value Earnings per share (basic) (in dollars per share) Earnings Per Share, Basic Due from affiliates Due from Affiliates Transfers to Other liabilities Noncontrolling Interest, Decrease from Transfers to Other Liabilities Noncontrolling Interest, Decrease from Transfers to Other Liabilities Sublease income Sublease Income Earnings Income (Loss) from Equity Method Investments Before Amortization of Intangibles Income (Loss) from Equity Method Investments Before Amortization of Intangibles Unvested units - beginning balance (in shares) Unvested units - ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Balance, beginning of period Balance, end of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Other assets Other Investments and Other Assets Other Investments and Other Assets Fair Value Measurement [Domain] Fair Value Measurement [Domain] Schedule II Valuation and Qualifying Accounts SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Impact of adoption of new accounting standard (ASU 2018-02) Cumulative Effect, Period of Adoption, Adjustment [Member] Deferred income tax liability (net) Deferred Tax Liabilities, Net Other non-cash items Other Noncash Income (Expense) Assets Derivative Asset, Fair Value, Gross Asset Achievement of Specified Financial Targets Achievement Of Specified Financial Targets [Member] Achievement Of Specified Financial Targets Gain (Loss) Recorded in Other Comprehensive Income (loss) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Commitments and Contingencies Commitment and Contingencies [Line Items] -- None. No documentation exists for this element. -- Schedule of Revenue and Fixed Assets, net of the Company by Geographic Location Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] Contingent payment obligations Business Combination, Consideration Transferred, Contingent Liabilities Incurred Business Combination, Consideration Transferred, Contingent Liabilities Incurred If changes in tax laws and interpretations occur Debt Instrument, Redemption, Period Two [Member] Entity Voluntary Filers Entity Voluntary Filers Stock options granted, fair value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value Intangible Amortization and Impairments Intangible Amortization And Impairments [Member] Intangible Amortization And Impairments Financial Assets Assets, Fair Value Disclosure [Abstract] Debt Increase in debt Long-term Debt Level 1 Fair Value, Inputs, Level 1 [Member] Cash flow from (used in) investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Goodwill impairment Goodwill, Impairment Loss Other liabilities Contingent payment obligation Other Liabilities Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Entity Small Business Entity Small Business Foreign currency translation, gross book value Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss), Before Adjustment On Accumulated Amortization Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss), Before Adjustment On Accumulated Amortization Additions based on current year tax positions Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions 2030 Senior Notes Senior Notes Three Point Three Zero Percent Due 2030 [Member] Senior Notes Three Point Three Zero Percent Due 2030 Receivables Accounts Receivable, after Allowance for Credit Loss Sales and distributions Other Investments, Sales Other Investments, Sales Intangible impairments Intangible impairments Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) Liabilities and Equity Liabilities and Equity [Abstract] Unrecognized tax benefits that, if recognized, would affect effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Interest rate swap Interest Rate Swap [Member] Hedging Relationship [Domain] Hedging Relationship [Domain] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] Entity Interactive Data Current Entity Interactive Data Current Intangible future amortization expense in 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Four Settlements Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Definite-lived Finite-lived Intangible Assets [Roll Forward] Affiliated Entity Affiliated Entity [Member] Noncontrolling Interest [Abstract] Noncontrolling Interest [Abstract] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Comprehensive income (non-controlling interests) Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Balance, beginning of period Balance, end of period Unrecognized Tax Benefits Total deferred tax assets Deferred Tax Assets, Gross Income Tax Authority [Domain] Income Tax Authority [Domain] Unrecognized Affiliate Equity Expense [Abstract] Unrecognized Affiliate Equity Expense [Abstract] Unrecognized Affiliate Equity Expense [Abstract] Entity Common Stock, Shares Outstanding (in shares) Entity Common Stock, Shares Outstanding Income tax provision Income Tax [Line Items] -- None. No documentation exists for this element. -- Net realized and unrealized (gains) losses Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings and Other Comprehensive Income (Loss) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings and Other Comprehensive Income (Loss) Market participant tax rate Fair Value Assumptions, Market Participant Tax Rate Fair Value Assumptions, Market Participant Tax Rate Deferred payment obligations Deferred Payment Obligations, Liability, Due [Abstract] Deferred Payment Obligations, Liability, Due Entity Address, State or Province Entity Address, State or Province Total stockholders' equity before treasury stock Stockholders' Equity before Treasury Stock Variable Interest Entity [Abstract] Variable Interest Entity [Abstract] Variable Interest Entity [Abstract] United Kingdom UNITED KINGDOM Carryforwards valuation allowance Operating Loss Carryforwards, Valuation Allowance Weighted Average Exercise Price, Exercisable at the end of the period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Junior subordinated notes Junior Subordinated Debt [Member] Accrued income tax interest and related charges Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Accounting Policies [Abstract] Accounting Policies [Abstract] Unexercised options outstanding at the end of the period Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Derivative Instrument [Axis] Derivative Instrument [Axis] Federal Current Federal Tax Expense (Benefit) Redeemable non-controlling interests Balance, beginning of period Balance, end of period Redeemable Noncontrolling Interest, Equity, Carrying Amount Document Transition Report Document Transition Report Call options Call Option [Member] Common stock ($0.01 par value, 153.0 shares authorized; 58.5 shares issued in 2020 and 2021) Common Stock, Value, Issued Stock options and restricted stock units Employee Stock Options and Restricted Stock [Member] Employee Stock Options and Restricted Stock [Member] Net change in unrealized (gains) losses relating to instruments still held at the reporting date Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) Weighted average period over which compensation expense will be recognized Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Unvested units - beginning balance (in dollars per share) Unvested units - ending balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings Other Comprehensive Income (Loss), Net Investment And Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Other Comprehensive Income (Loss), Net Investment And Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Lease Commitments Lessee, Operating Leases [Text Block] 2025 Senior Notes Senior Notes Three Point Five Zero Percent Due 2025 [Member] Senior Notes 3.50% Due 2025 Foreign currency translation, accumulated depreciation Finite Lived Intangible Asset, Accumulated Amortization, Foreign Currency Translation Finite Lived Intangible Asset, Accumulated Amortization, Foreign Currency Translation Business Combinations Business Combination Disclosure [Text Block] Other investments Balance, beginning of period Balance, end of period Other Investments ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Schedule of Assumptions Used to Determine Fair Value of Options Granted Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Company Stock Option Transactions Share-based Payment Arrangement, Activity [Table Text Block] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Ownership [Axis] Ownership [Axis] Foreign Deferred Foreign Income Tax Expense (Benefit) Investments in Marketable Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Legal Entity [Axis] Legal Entity [Axis] Income before income taxes (controlling interest) Income (Loss) from Continuing Operations before Income Taxes Attributable to Parent This element represents the income or loss from continuing operations, before income taxes, which is attributable to the controlling interest. Stock options and restricted stock units (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Investments in Marketable Securities Marketable Securities, Policy [Policy Text Block] Class of Stock [Axis] Class of Stock [Axis] Net income (controlling interest) Business Acquisition, Pro Forma Net Income (Loss) Schedule of Reconciliation of Unrecognized Tax Benefits Summary of Income Tax Contingencies [Table Text Block] Junior convertible securities interest Deferred Tax Liabilities, Convertible Securities Interest The cumulative amount of the estimated future tax effects attributable to the difference between the tax basis of convertible securities interest and the basis of convertible securities interest computed in accordance with generally accepted accounting principles. Income Tax Authority [Axis] Income Tax Authority [Axis] Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Entity [Domain] Entity [Domain] Consolidated revenue Revenue from Contract with Customer, Excluding Assessed Tax 5.875% Junior Subordinated Notes due 2059 2059 Junior Subordinated Notes Five Point Eight Seventy Five Junior Subordinated Notes Due 2059 [Member] Five Point Eight Seventy Five Junior Subordinated Notes Due 2059 October 2019 Program October 2019 Program [Member] October 2019 Program Numerator Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Payment contingent on not meeting financial targets (up to) Other Commitment, Contingent Consideration, Asset Other Commitment, Contingent Consideration, Asset Foreign operating loss carryforwards, expiration period Operating Loss Carryforwards, Foreign, Expiration Period Operating Loss Carryforwards, Foreign, Expiration Period Stock Options Share-based Payment Arrangement, Option [Member] Equity [Abstract] Equity [Abstract] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Measurement Input Type [Domain] Measurement Input Type [Domain] Affiliate equity purchase obligations Due to Related Parties, Fair Value Disclosure Due to Related Parties, Fair Value Disclosure Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Gain (Loss) Recorded in Other Comprehensive Income (loss) Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax Variable Rate [Axis] Variable Rate [Axis] 4.750% Junior Subordinated Notes due 2060 2060 Junior Subordinated Notes Four Point Seven Five Percent Junior Subordinated Notes Due 2060 [Member] Four Point Seven Five Percent Junior Subordinated Notes Due 2060 Geographic Information Segment Reporting Disclosure [Text Block] Net realized and unrealized gains Other Investments, Gain (Loss), Net Other Investments, Gain (Loss), Net Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Document Fiscal Year Focus Document Fiscal Year Focus Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Variable Rate [Domain] Variable Rate [Domain] Additional Paid-In Capital Additional Paid-in Capital [Member] Dividends (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] New investments contributed revenue Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Payables recorded for Affiliate equity purchases Payables Recorded for Affiliate Equity Purchases Payables recorded for affiliate equity purchases. Participant tax rate Measurement Input, Participant Tax Rate [Member] Measurement Input, Participant Tax Rate Entity Information [Line Items] Entity Information [Line Items] Other Assets Other Assets [Member] Discount rates, performance based fees Measurement Input, Discount Rate, Performance Based Fees [Member] Measurement Input, Discount Rate, Performance Based Fees Affiliate divestments Effective Income Tax Rate Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary, Percent Foreign currency translation Indefinite-lived Intangible Assets, Foreign Currency Translation Gain (Loss) Maximum Maximum [Member] Share-based Payment Arrangement [Abstract] Share-based Payment Arrangement [Abstract] 2023 Business Combination, Contingent Consideration, Liability, to be Paid, Year Two Business Combination, Contingent Consideration, Liability, to be Paid, Year Two (Increase) decrease in receivables Increase (Decrease) in Receivables Award Type [Axis] Award Type [Axis] Cash flow from (used in) financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Schedule of the Company's Maturity of Lease Liabilities Lessee, Operating Lease, Liability, Maturity [Table Text Block] Total stockholders' equity Stockholders' Equity Attributable to Parent City Area Code City Area Code Affiliate equity purchases Affiliate equity purchases Payments for Affiliate Equity Repurchases Payments for Affiliate Equity Repurchases Intrinsic value of exercisable options outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Equity Method Investments in Affiliates Equity Method Investments and Joint Ventures Disclosure [Text Block] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Interest expense on junior convertible securities, net of taxes Interest on Convertible Debt, Net of Tax Repurchase of common stock (net) Payments for Repurchase of Common Stock Estimated useful lives of fixed assets Property, Plant and Equipment, Useful Life Weighted Average Remaining Contractual Life (Years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Life [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Life Concentration of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Adjustments for New Accounting Pronouncements [Axis] Accounting Standards Update [Axis] Current taxes Total current Current Income Tax Expense (Benefit) Par value Principal Amount at Maturity Debt Instrument, Face Amount Performance condition changes (in dollars per share) Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Performance Condition Changes, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Performance Condition Changes, Weighted Average Grant Date Fair Value Tax Benefit Share-based Payment Arrangement, Expense, Tax Benefit Investments in Affiliates Noncontrolling Interest, Increase From Investments In Affiliates Noncontrolling Interest, Increase From Investments In Affiliates Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Restricted Stock Units Restricted Stock Units (RSUs) [Member] Schedule of Purchase Price Allocaiton Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Additions Charged to Other Accounts SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account Total deferred tax liabilities Deferred Tax Liabilities, Gross Business Acquisition Business Acquisition [Line Items] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Carrying amount and maximum exposure to loss equity method investments considered VREs Equity Method Investments Discounted cash flow Valuation Technique, Discounted Cash Flow [Member] Income Statement [Abstract] Income Statement [Abstract] Entity Registrant Name Entity Registrant Name Sales of securities by consolidated Affiliate sponsored investment products Sale of Securities by Affiliate Sponsored Consolidated Products Sale of Securities by Affiliate Sponsored Consolidated Products Deductions SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction Senior notes Notes Payable, Fair Value Disclosure Return of capital Proceeds From Equity Method Investment, Return Of Capital Proceeds From Equity Method Investment, Return Of Capital Related Party Transaction [Axis] Related Party Transaction [Axis] Options forfeited (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Income tax expense Income tax expense Income Tax Expense (Benefit) Other Commitments [Domain] Other Commitments [Domain] Other Goodwill, Other Increase (Decrease) Senior bank debt Unsecured Debt [Member] Affiliate equity compensation Affiliate Equity Compensation Expense, Including Adjustments and Portion Attributable to Noncontrolling Interest Affiliate Equity Compensation Expense, Including Adjustments and Portion Attributable to Noncontrolling Interest Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Tax Identification Number Entity Tax Identification Number Investment Type [Axis] Investment Type [Axis] Document Fiscal Period Focus Document Fiscal Period Focus Total undiscounted lease liabilities Lessee, Operating Lease, Liability, to be Paid Intangible amortization and impairments Equity Method Investment, Intangible Asset Amortization and Impairments Equity Method Investment, Intangible Asset Amortization and Impairments Units forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Schedule of Investments without Readily Determinable Fair Value Equity Securities without Readily Determinable Fair Value [Table Text Block] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Share-Based Compensation Plans Share-based Payment Arrangement [Policy Text Block] Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Changes in redemption value Redeemable Noncontrolling Interest Change in Redemption Value Increase (decrease) in redeemable non-controlling interests during the period as a result of a change in the redemption value. Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] 2024 Business Combination, Contingent Consideration, Liability, to be Paid, Year Three Business Combination, Contingent Consideration, Liability, to be Paid, Year Three Stock options granted, weighted average fair value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Equity Component [Domain] Equity Component [Domain] Accrued deferred tax assets for indirect tax benefits associated with uncertain tax positions Tax benefit of uncertain tax positions Deferred Tax Assets, Tax Benefit on Uncertain Tax Positions Represents the tax benefit as of the balance sheet date of the amount of future tax deductions arising from uncertain tax positions. 2022 Lessee, Operating Lease, Liability, to be Paid, Year One Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Changes in U.S. tax provision to return Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Percent Impairment of definite-lived intangible assets Impairment of Intangible Assets, Finite-lived Total contingent payments Other Commitment Intangible assets Intangible Asset [Line Items] -- None. No documentation exists for this element. -- Schedule of Share-Based Compensation Expense Share-based Payment Arrangement, Cost by Plan [Table Text Block] Sale of investment securities Proceeds from Sale, Maturity and Collection of Investments Change in valuation allowances Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Buildings and leasehold improvements Building and Leasehold Improvements [Member] Represents the long lived, depreciable structure held for productive use, including office, production, storage and distribution facilities and depreciable asset that is an addition or improvement to assets held under a lease arrangement. Counterparty Name [Domain] Counterparty Name [Domain] Forward Contract Indexed to Issuer's Equity, Type [Axis] Forward Contract Indexed to Issuer's Equity, Type [Axis] Summary of Fair Value of Investments and Unfunded Commitments Fair Value Measurement, Inputs Based on Net Assets [Table Text Block] Tabular disclosure of investments that rely on net asset value as their fair value, including the nature of the investment and any related liquidation restrictions. Junior convertible securities Carrying Value Convertible Debt, Fair Value Disclosures 2025 Lessee, Operating Lease, Liability, to be Paid, Year Four Weighted Average Weighted Average [Member] Purchase of investment securities Payments to Acquire Marketable Securities Growth rates Measurement Input, Long-term Revenue Growth Rate [Member] Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Level 2 Fair Value, Inputs, Level 2 [Member] Type of Adoption [Domain] Accounting Standards Update [Domain] Auditor Location Auditor Location Segment Reporting [Abstract] Segment Reporting [Abstract] Deferred compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits Use of Estimates Use of Estimates, Policy [Policy Text Block] Schedule of Basic and Diluted Earnings (Loss) Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Title of 12(b) Security Title of 12(b) Security Divestments of Affiliates and return of capital from equity method investments Proceeds from Divestiture of Interest in Subsidiaries and Affiliates And Proceeds From Equity Method Investment, Return Of Capital Proceeds from Divestiture of Interest in Subsidiaries and Affiliates And Proceeds From Equity Method Investment, Return Of Capital Purchases and issuances Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Purchases And Issuances Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Purchases And Issuances Foreign tax credits Deferred Tax Assets, Tax Credit Carryforwards, Foreign Deferred tax liability Deferred Tax Liability from Excess Interest Expense Calculation Represents the deferred taxes generated from the excess of the interest expense calculated under federal income tax regulations over interest expense as calculated for book purposes. Common stock, shares authorized (in shares) Common Stock, Shares Authorized Net income (controlling interest), as adjusted Net Income (Loss) Available to Common Stockholders, Diluted Net income (controlling interest) Net Income (Loss) Available to Common Stockholders, Basic Document Type Document Type Foreign currency translation Equity Method Investment, Realized Gain (Loss) on Foreign Currency Translation Equity Method Investment, Realized Gain (Loss) on Foreign Currency Translation Payables and Accrued Liabilities Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Product and Service [Domain] Product and Service [Domain] Discount for lack of marketability Measurement Input, Discount for Lack of Marketability [Member] Stated interest rate Stated coupon Debt Instrument, Interest Rate, Stated Percentage Net income (non-controlling interests) Net Income (Loss) Attributable to Noncontrolling Interest Redeemable Non-Controlling Interests Noncontrolling Interest Disclosure [Text Block] Foreign currency translation, net book value Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss) Total Total Contingent payment obligation Business Combination, Contingent Consideration, Liability Stock received for tax withholdings on share-based payments Shares Received for Tax Withholding for Share Based Compensation, Value Shares Received for Tax Withholding for Share Based Compensation, Value Share-based Compensation Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Net Book Value Intangible Assets [Roll Forward] -- None. No documentation exists for this element. -- Measurement Frequency [Axis] Measurement Frequency [Axis] Income Tax Valuation Allowance SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] Derivative notional amount Derivative Liability, Notional Amount Schedule of Total Lease Costs (Net) Lease, Cost [Table Text Block] Effect of income from non-controlling interests Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent Geographical [Axis] Geographical [Axis] State State and Local Jurisdiction [Member] Net Investment Hedging Net Investment Hedging [Member] Hedging Relationship [Axis] Hedging Relationship [Axis] Weighted average interest rate on amount outstanding Long-term Debt, Weighted Average Interest Rate, at Point in Time Cash collateral held at counterparty Derivative, Collateral, Right to Reclaim Cash Other Other Accrued Liabilities Equity Distribution Program Forward Equity Agreement [Member] Forward Equity Agreement Cash flow used in financing activities Net Cash Provided by (Used in) Financing Activities 2023 Deferred Payment Obligations, Liability, to be Paid, Year Two Deferred Payment Obligations, Liability, to be Paid, Year Two Less: Treasury stock, at cost (14.5 shares in 2020 and 18.3 shares in 2021) Treasury Stock, Value Denominator Weighted Average Number of Shares Outstanding, Diluted [Abstract] Non-deductible intangible amortization Deferred Tax Liabilities, Nondeductible Intangible Assets, Amortization Represents the tax effect of future book amortization of intangibles that do not qualify for step-up and amortization for tax purposes. Stock vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Related Party Transactions Related Party Transaction [Line Items] Interest and penalties related to unrecognized tax benefits Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Stock program, maximum amount authorized Stock Issuable, Value, Maximum Stock Issuable, Value, Maximum Variable Interest Entities Variable Interest Entities -- None. No documentation exists for this element. -- Equity method income (loss) (net) Equity method loss (income) (net) Income (Loss) from Equity Method Investments Foreign tax credits, expiration period Deferred Tax Assets, Tax Credit Carryforwards, Foreign, Expiration Period Deferred Tax Assets, Tax Credit Carryforwards, Foreign, Expiration Period Other expenses (net) Other Cost and Expense, Operating Fair Value Measurements Fair Value Disclosures [Text Block] Schedule of Income Tax Provisions by Controlling and Noncontrolling Interests Schedule of Components of Income Tax (Expense) Benefit by Controlling and Noncontrolling interests [Table Text Block] Tabular disclosure of the components of income tax expense attributable to controlling and non-controlling interests for each year presented including, income before income taxes and effective tax rate attributable to controlling interests. Contingent payments in year one Other Commitment, to be Paid, Year One Intangible future amortization expense in 2024 Finite-Lived Intangible Asset, Expected Amortization, Year Three Expected payments Other Commitment Expected Payments Other Commitment Expected Payments Foreign Foreign Tax Authority [Member] Deferred Tax Liabilities Deferred Tax Liabilities, Gross [Abstract] Contingent Payment Obligations Business Combinations Policy [Policy Text Block] Derivative [Table] Derivative [Table] Fair Value Alternative Investment Treasury Rate Treasury Rate [Member] Treasury Rate Document Period End Date Document Period End Date Intangible amortization and impairments Intangible amortization and impairments Amortization and Impairments of Intangible Assets Amortization and Impairments of Intangible Assets Stock repurchase program, number of shares authorized (in shares) Stock Repurchase Program, Number of Shares Authorized to be Repurchased Stock  Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Consolidated Entities [Domain] Consolidated Entities [Domain] State income taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent State Deferred State and Local Income Tax Expense (Benefit) Other Investments Investment [Text Block] Schedule of Fixed Assets Property, Plant and Equipment [Table Text Block] Income Statement Location [Domain] Income Statement Location [Domain] Debt instrument term Debt Instrument, Term Supplemental disclosure of non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Affiliate equity compensation expense Affiliate Equity Compensation Expense, Including Portion Attributable to Noncontrolling Interest Affiliate Equity Compensation Expense, Including Portion Attributable to Noncontrolling Interest Acquisition-related costs incurred Business Acquisition, Transaction Costs investments in other strategies Other Funds [Member] Other Funds Fixed assets (net) Fixed assets (net) Fixed assets (net) Property, Plant and Equipment, Net Total consolidated expenses Operating Expenses Total AOCI Including Portion Attributable to Noncontrolling Interest [Member] Land, improvements and other Land and Land Improvements [Member] Performance condition changes (in dollars per share) Share-Based Compensation Arrangements By Share-based Payment Award, Options, Performance Condition Changes, Weighted Average Exercise Price Share-Based Compensation Arrangements By Share-based Payment Award, Options, Performance Condition Changes, Weighted Average Exercise Price Schedule of Affiliate Equity Compensation Summary of Affiliate Equity Compensation [Table Text Block] Summary of Affiliate Equity Compensation Expense [Table Text Block] Repayments of senior bank debt and junior convertible securities Repayments of long-term debt Repayments of Long-term Debt Investments in marketable securities Fair value Marketable Securities Earnings Per Share [Abstract] Earnings Per Share [Abstract] Carrying Value and Maximum Exposure to Loss Variable Interest Entity, Nonconsolidated, Comparison of Carrying Amount of Assets and Liabilities to Maximum Loss Exposure Equity Method Investee Equity Method Investee [Member] Upward adjustments Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount Fixed assets, at cost Property, Plant and Equipment, Gross Noncontrolling Interest [Table] Noncontrolling Interest [Table] Non-controlling Interests Affiliate Equity, Unrecognized Compensation Expense, Attributable to Noncontrolling Interest Affiliate Equity, Unrecognized Compensation Expense, Attributable to Noncontrolling Interest Revenues Revenues Amounts reclassified Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Estimated Future Amortization Expense of Finite-Lived Intangibles Finite-Lived Intangible Assets, Net, Amortization Expense, Rolling Maturity [Abstract] Tangible assets, net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tangible Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tangible Assets Proceeds from derivative termination Proceeds from Derivative Instrument, Investing Activities Unexercised options outstanding - beginning balance (in dollars per share) Unexercised stock options outstanding - ending balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Gain (Loss) Recorded in Earnings from Excluded Components Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments, before Tax Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Entity Current Reporting Status Entity Current Reporting Status Measurement input Equity Method Investment, Measurement Input Equity Method Investment, Measurement Input Weighted Average Grant Date Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Effective tax rate Effective tax rate Effective Income Tax Rate Reconciliation, Percent Fair value of deconsolidated investment in affiliate Marketable Securities, Fair Value, Deconsolidation Marketable Securities, Fair Value, Deconsolidation Counterparty Name [Axis] Counterparty Name [Axis] Prior Owner Prior Owner [Member] Prior Owner of entity Excess tax benefit (deficiency) recognized from share-based incentive plans Excess Tax Benefit from Share-based Compensation, Operating Activities Investment and other income Investment and Other Income (Loss) The amount of income from cost method investments, foreign currency transaction gain or loss and other income recognized during the period. United States UNITED STATES Discount rates Discount rates, performance based fees Measurement Input, Discount Rate [Member] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss) Attributable to Parent, Net of Tax Accumulated change in equity applicable to the parent entity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. Subscriptions to consolidated Affiliate sponsored investment products, net of redemptions Subscriptions to Affiliate Sponsored Consolidated Products, Net of Redemptions Subscriptions to Affiliate Sponsored Consolidated Products, Net of Redemptions On or after September 30, 2026 Debt Instrument, Redemption, Period One [Member] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table] Valuation Allowance by Deferred Tax Asset [Axis] Valuation Allowance by Deferred Tax Asset [Axis] Forfeiture rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Forfeiture Rate Represents the expected rate the entity will cancel the stock option awards due to nonfulfillment of certain conditions of equity-based compensation arrangements. Leases [Abstract] Leases [Abstract] Income Taxes Income Tax, Policy [Policy Text Block] LIBOR London Interbank Offered Rate (LIBOR) [Member] Undistributed earnings and tangible capital Investment Company, Distributable Earnings (Loss), Accumulated Long-term Capital Gain (Loss) Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) [Line Items] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Schedule of Accounts Payable and Accrued Liabilities Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Average shares outstanding (diluted) (in shares) Average shares outstanding (diluted) (in shares) Weighted Average Number of Shares Outstanding, Diluted Domestic Income (Loss) from Continuing Operations before Income Taxes, Domestic Income Taxes Income Tax Disclosure [Text Block] Non-controlling interests Affiliate Equity Compensation Expense, Attributable to Noncontrolling Interest Affiliate Equity Compensation Expense, Attributable to Noncontrolling Interest Related Party [Domain] Related Party [Domain] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Basis spread over variable debt rate Debt Instrument, Basis Spread on Variable Rate Repurchases of junior convertible securities Repurchase of junior convertible securities, equity impact Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Lease contract Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Lease Obligation Carrying Value and Maximum Exposure to Loss Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Class of Stock [Line Items] Class of Stock [Line Items] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Entity Address, Address Line One Entity Address, Address Line One Audit Information [Abstract] Audit Information [Abstract] Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Transfers, gross book value Finite-Lived Intangible Assets, Gross, Transfers Finite-Lived Intangible Assets, Gross, Transfers Co-Investor Coinvestor [Member] Coinvestor Cash flow from (used in) operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Principles of Consolidation Consolidation, Policy [Policy Text Block] Entity Shell Company Entity Shell Company Expected life of options (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Forward foreign currency contracts Foreign Exchange Forward [Member] Private Equity Investment Partnerships of Affiliate Private Equity Investment Partnerships of Affiliate [Member] Private Equity Investment Partnerships of Affiliate [Member] Current Fiscal Year End Date Current Fiscal Year End Date Affiliate Equity [Line Items] Affiliate Equity [Line Items] [Line Items] for Affiliate Equity [Table] Statement [Table] Statement [Table] Recent Accounting Developments New Accounting Pronouncements, Policy [Policy Text Block] Other Deferred Tax Assets, Other Other Commitments [Axis] Other Commitments [Axis] Assumptions used to determine fair value of options granted Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Expire over a 20-year period Expire Over Twenty Year Period [Member] Expire Over Twenty Year Period Compensation expense related to share-based compensation Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Statistical Measurement [Axis] Statistical Measurement [Axis] Subsequent Event Subsequent Event [Member] Foreign loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards, Foreign Beginning balance, net book value Ending balance, net book value Definite-lived acquired client relationships (net) Finite-Lived Intangible Assets, Net Goodwill Balance, beginning of period Balance, end of period Goodwill Discount rate for assets based fees Fair Value Assumptions, Discount Rate For Assets Based Fees Fair Value Assumptions, Discount Rate For Assets Based Fees Sales and distributions Equity Securities Without Readily Determinable Fair Value, Sales And Distributions Equity Securities Without Readily Determinable Fair Value, Sales And Distributions Foreign operations Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Volatility Measurement Input, Price Volatility [Member] January 2021 Program January 2021 Program [Member] January 2021 Program Fair Value Measured at NAV Fair Value Measured at Net Asset Value Per Share [Member] Accounting Standards Update 2020-06 Accounting Standards Update 2020-06 [Member] Schedule of Changes in Goodwill Schedule of Goodwill [Table Text Block] Adjustments to reconcile Net income to cash flow from (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Affiliate Equity Affiliate Equity [Text Block] Disclosures related to the conditional rights and obligations the company has to acquire Affiliate equity and the redeemable non-controlling interests on the consolidated balance sheets. Disclosure of the impact on the controlling interest's equity of changes in ownership at its Affiliates. Subsequent Event Type [Axis] Subsequent Event Type [Axis] State net operating loss carryforwards, expiration period Operating Loss Carryforwards, State and Local Expiration Period The period (in years) over which the state net operating loss carryforwards included in total operating loss carryforwards shall expire. Schedule of Company's Derivative Assets and Liabilities Measured at Fair Value on Recurring Basis Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Operating lease costs Operating Lease, Cost Cumulative unrealized gains Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount Related Party Transactions Related Party Transactions Disclosure [Text Block] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Closure of Certain Retail Investment Products Closure Of Certain Retail Investment Products [Member] Closure Of Certain Retail Investment Products Deferred income tax (benefit) expense Deferred taxes Total deferred Deferred Income Tax Expense (Benefit) Payments for Achievement of Financial Targets Payments For Achievement Of Financial Targets [Member] Payments For Achievement Of Financial Targets [Member] Hedging Designation [Domain] Hedging Designation [Domain] Deferred tax liabilities, net, decrease resulting from repurchase of junior convertible securities Deferred Tax Liabilities, Net, Decrease Resulting From Repurchase Of Debt Deferred Tax Liabilities, Net, Decrease Resulting From Repurchase Of Debt Statutory U.S. federal tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Redeemable Non-controlling Interests Redeemable Noncontrolling Interest [Roll Forward] -- None. No documentation exists for this element. -- Schedule of Share Repurchase Activity Class of Treasury Stock [Table Text Block] Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Net income (controlling interest) Net income (controlling interest) Net Income (Loss) Attributable to Parent Receivables Receivable [Policy Text Block] Obligations to related parties, measurement input Obligations to Related Parties, Measurement Input Obligations to Related Parties, Measurement Input Investments in Affiliates Obligations And Payments To Acquire Interest In Subsidiaries And Affiliates Obligations And Payments To Acquire Interest In Subsidiaries And Affiliates Income Statement Location [Axis] Income Statement Location [Axis] Beginning balance, accumulated amortization Ending balance, accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Statistical Measurement [Domain] Statistical Measurement [Domain] Term of conditional right put interest Term Of Conditional Right to Put Interest Term Of Conditional Right to Put Interest Schedule of Principal Terms of Senior and Junior Subordinated Notes Schedule of Maturities of Long-term Debt [Table Text Block] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Effect of deconsolidation of Affiliates and Affiliate sponsored investment products Cash Divested from Deconsolidation Additional paid-in capital Decrease in additional paid-in-capital Additional Paid in Capital, Common Stock Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Retirement Benefits [Abstract] Retirement Benefits [Abstract] Entity File Number Entity File Number Redemption price percentage Debt Instrument, Redemption Price, Percentage Share-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Other Equity Method Investment, Other Increase (Decrease) Equity Method Investment, Other Increase (Decrease) 2061 Junior Subordinated Notes Four Point Two Percent Junior Subordinated Notes Due 2061 [Member] Four Point Two Percent Junior Subordinated Notes Due 2061 Valuation and Qualifying Accounts SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] Change in Equity Method Investments in Affiliates [Roll Forward] Change in Equity Method Investments in Affiliates [Roll Forward] Change in Equity Method Investments in Affiliates Business Acquisition, Contingent Consideration [Line Items] Business Acquisition, Contingent Consideration [Line Items] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Convertible securities (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Variable lease costs Variable Lease, Cost Put options Put Option [Member] Liability Class [Axis] Liability Class [Axis] Commitment fee amount Line of Credit Facility, Commitment Fee Amount Buildings Building [Member] New investments contributed net income (controlling interest) Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Impairment expense Equity Method Investment, Other than Temporary Impairment Stocks granted, fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Units granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Share Repurchase Program [Domain] Share Repurchase Program [Domain] Schedule of Contingent Consideration Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block] Assets Assets [Abstract] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Schedule of Financial Liabilities not Carried at Fair Value Summary of Other Financial Liabilities Not Carried at Fair Value [Table Text Block] Summary of Other Financial Liabilities Not Carried at Fair Value [Table Text Block] Other Liabilities Other Liabilities [Member] Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Units granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Goodwill and Acquired Client Relationships Goodwill and Intangible Assets Disclosure [Text Block] Fixed Assets Property, Plant and Equipment, Policy [Policy Text Block] Changes in redemption value of Redeemable non-controlling interests Redeemable Noncontrolling Interest, Equity, Change In Redemption Value Redeemable Noncontrolling Interest, Equity, Change In Redemption Value Unexercised options outstanding - beginning balance (in shares) Unexercised options outstanding - ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Other Allowances SEC Schedule, 12-09, Allowance, Notes Receivable [Member] Trade name Trade Names [Member] Debt Instrument [Axis] Debt Instrument [Axis] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Related Party [Axis] Related Party [Axis] Fair Value, Assets and Liabilities, Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Right-of-use assets obtained in exchange for new operating leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Schedule of Unaudited Pro Forma Financial Results Business Acquisition, Pro Forma Information [Table Text Block] Schedule of Components of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Settlements and reductions Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements And Reductions Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements And Reductions Schedule of Changes in the Company's Interest in its Affiliates on the Controlling Interest's Equity Schedule of Net Income (Loss) Attributable to Entity and Net Transfers with Noncontrolling Interest [Table Text Block] Represents a schedule of net income (loss) attributable to the entity and net transfers to non-controlling interest. Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Pre-Tax Other Comprehensive Income (Loss), before Tax Number of operating segments Number of Operating Segments Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] 2024 Lessee, Operating Lease, Liability, to be Paid, Year Three Payables recorded for investments in Affiliates and contingent payment obligations Payables Recorded, But Not Yet Paid, Investments In Affiliates Payables Recorded, But Not Yet Paid, Investments In Affiliates SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] Affiliated Managers Group, Inc. and Coinvestor Affiliated Managers Group, Inc. And Coinvestor [Member] Affiliated Managers Group, Inc. And Coinvestor Commitment and Contingencies [Table] Commitment and Contingencies [Table] Represents commitments and contingencies of the entity. Restricted Stock Units Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Schedule of Company Restricted Stock Units Transactions Schedule of Nonvested Share Activity [Table Text Block] Lease liabilities paid Operating Lease, Payments Projected growth rate Measurement Input, Projected Growth Rate [Member] Measurement Input, Projected Growth Rate Enterprise value Business Combination, Consideration Transferred Goodwill [Roll Forward] Goodwill [Roll Forward] Affiliate Equity [Table] Affiliate Equity [Table] Affiliate Equity [Table] Reconciliation of beginning and ending amount of unrecognized tax benefits Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Total liabilities and equity Liabilities and Equity Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent 2026 Lessee, Operating Lease, Liability, to be Paid, Year Five Options exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Purchases and commitments Equity Securities Without Readily Determinable Fair Value, Purchases And Commitments Equity Securities Without Readily Determinable Fair Value, Purchases And Commitments Non-controlling interests Other Noncontrolling Interests Derivative [Line Items] Derivative [Line Items] (Decrease) increase in payables, accrued liabilities and other liabilities Increase (Decrease) in Operating Liabilities Gain (Loss) Recorded in Other Comprehensive Income (loss) Other Comprehensive Income (Loss), Net Investment And Cash Flow Hedge, Gain (Loss), Before Reclassification And Tax Other Comprehensive Income (Loss), Net Investment And Cash Flow Hedge, Gain (Loss), Before Reclassification And Tax Earnings Per Share Earnings Per Share [Text Block] Share repurchases Share repurchases, amount Treasury Stock, Value, Acquired, Cost Method Schedule of Intangible Assets, by Major Class [Table] Schedule of Intangible Assets, by Major Class [Table] Tabular disclosure of the major classes of acquired finite-lived and indefinite-lived intangible assets showing the amount, any significant residual value, weighted average amortization period, and other characteristics. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. Consolidated expenses: Operating Expenses [Abstract] Average Price (in dollars per share) Treasury Stock Acquired, Average Cost Per Share Decrease in controlling interest paid-in capital from Affiliate equity purchases Adjustments To Additional Paid In Capital, Decrease In Carrying Amount Of Redeemable Noncontrolling Interests Adjustments To Additional Paid In Capital, Decrease In Carrying Amount Of Redeemable Noncontrolling Interests Market participant tax rates Measurement Input, Market Participant Tax Rates [Member] Measurement Input, Market Participant Tax Rates Minimum Minimum [Member] 2023 Lessee, Operating Lease, Liability, to be Paid, Year Two Outstanding borrowings Long-term Line of Credit Effect of foreign currency exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Fair Value Financial and Nonfinancial Liabilities, Fair Value Disclosure Total Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Selling, general and administrative Selling, General and Administrative Expense Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets [Axis] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] Debt Debt Disclosure [Text Block] Schedule of Consolidated Provision for Income Taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Share-Based Compensation Share-based Payment Arrangement [Text Block] 2022 Business Combination, Contingent Consideration, Liability, to be Paid, Year One Business Combination, Contingent Consideration, Liability, to be Paid, Year One Senior notes Senior Notes [Member] Contingent Payment Obligations Contingent Payment Arrangements [Member] Represents contingent payment arrangements of the entity. Level 3 Fair Value, Inputs, Level 3 [Member] Dividends paid on common stock Payments of Ordinary Dividends, Common Stock Leases Lessee, Leases [Policy Text Block] Quantitative information for Level 3 Fair Value Measurements Liabilities Fair Value Measurement Inputs and Valuation Techniques [Line Items] Investments in Affiliates, net of cash acquired Payments to Acquire Interest in Subsidiaries and Affiliates Payable and accrued liabilities Payables and accrued liabilities Accounts Payable and Accrued Liabilities Growth rate period Measurement Input, Growth Rate Period [Member] Measurement Input, Growth Rate Period New investments Goodwill, Acquired During Period Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Commitments and contingencies (Note 8) Commitments and Contingencies Schedule of Changes in Redeemable Non-Controlling Interests Redeemable Noncontrolling Interest [Table Text Block] Entity Emerging Growth Company Entity Emerging Growth Company Foreign currency translation Intangible Assets Net Excluding Goodwill Translation Adjustments Represents the amount of increase (decrease) to assets, excluding financial assets and goodwill, for foreign currency translation adjustments. Parnassus & Abacus Parnassus Investments And Abacus Capital Group LLC [Member] Parnassus Investments And Abacus Capital Group LLC Co-investment commitments in partnership Investment Commitment, Amount The amount that the entity agreed to co-invest in certain investment partnerships where the entity serves as the general partner. Term Loan Senior Unsecured Term Loan [Member] Senior Unsecured Term Loan 2025 Deferred Payment Obligations, Liability, to be Paid, Year Four Deferred Payment Obligations, Liability, to be Paid, Year Four Auditor Name Auditor Name Cover [Abstract] Cover [Abstract] Other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Treasury stock, shares (in shares) Treasury Stock, Shares Present value discounting of operating lease liabilities Lessee, Operating Lease, Liability, Undiscounted Excess Amount Payments for derivative settlement Payments for Derivative Instrument, Investing Activities Equipment Office Equipment [Member] Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Transfers, accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization, Transfers Finite-Lived Intangible Assets, Accumulated Amortization, Transfers Carrying Value Reported Value Measurement [Member] Due to affiliates Due to Affiliate Change in net realized and unrealized gain (loss) on derivative financial instruments Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments and Tax Investments in Affiliates and Affiliate Sponsored Investment Products Variable Interest Entities Disclosure [Text Block] This element represents the disclosure of variable interest entities (VIE), including, but not limited to the nature, purpose, size, and activities of the VIE, the carrying amount and classification of consolidated assets that are collateral for the VIE's obligations, lack of recourse if creditors (or beneficial interest holders) of a consolidated VIE have no recourse to the general credit of the primary beneficiary. Which also include information related to Sponsored Investment Funds and Trust Preferred Vehicles related to variable interest entities (VIE). Monte Carlo simulation Valuation Technique, Monte Carlo Simulation [Member] Monte Carlo Valuation Technique Common Stock ($0.01 par value) Common Stock Common Stock [Member] International Income (Loss) from Continuing Operations before Income Taxes, Foreign Payment contingent on exercise of option to reduce ownership percentage Other Commitment, Contingent Consideration, Option To Reduce Ownership Interest, Asset Other Commitment, Contingent Consideration, Option To Reduce Ownership Interest, Asset Liabilities and Non-controlling interests Liabilities And Noncontrolling Interests Liabilities And Noncontrolling Interests Expenses related to benefit plans Defined Contribution Plan, Employer Discretionary Contribution Amount Business and Summary of Significant Accounting Policies Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Intangible future amortization expense in 2023 Finite-Lived Intangible Asset, Expected Amortization, Year Two Hedging Designation [Axis] Hedging Designation [Axis] Affiliate equity issuances Proceeds from Affiliate Equity Issuances Proceeds from Affiliate Equity Issuances Share-based compensation and Affiliate equity expense Share-based Payment Arrangement, Noncash Expense Components of Accumulated other comprehensive income, net of taxes AOCI Attributable to Parent, Net of Tax [Roll Forward] Contingent payments after year one Other Commitment, To Be Paid, After Year One Other Commitment, To Be Paid, After Year One Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Treasury Stock at Cost Treasury Stock [Member] Growth rate Measurement Input, Growth Rate [Member] Measurement Input, Growth Rate Issuances Noncontrolling Interest, Increase (Decrease) from Subsidiary Equity Issuance Noncontrolling Interest, Increase (Decrease) from Subsidiary Equity Issuance Purchase of fixed assets Payments to Acquire Property, Plant, and Equipment Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Total liabilities Liabilities Deferred Tax Assets Deferred Tax Assets, Net [Abstract] Intangible future amortization expense in 2022 Finite-Lived Intangible Asset, Expected Amortization, Year One Options granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Business combination, recognized identifiable assets acquired, goodwill, and liabilities assumed, net, measurement input Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Measurement Input Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Measurement Input Measurement Input Type [Axis] Measurement Input Type [Axis] Operating loss carryforwards Operating Loss Carryforwards Common stock, shares issued (in shares) Common Stock, Shares, Issued Total Deferred Payment Obligations, 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Earnings per share (diluted) (in dollars per share) Earnings Per Share, Diluted Average shares outstanding (basic) (in shares) Weighted Average Number of Shares Outstanding, Basic Effect of dilutive instruments: Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] Net investments Indefinite-lived Intangible Assets Acquired Income taxes paid (refunds received), net Income Taxes Paid, Net Equity method investments in Affiliates (net) Carrying value of equity method investment in affiliate Equity method investments in Affiliates (net) Balance, beginning of period Balance, end of period Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Increase (decrease) attributable to consolidated Affiliate sponsored investment products Noncontrolling Interest, Increase (Decrease) Attributable to Consolidated Partnerships Noncontrolling Interest, Increase (Decrease) Attributable to Consolidated Partnerships Accounting Standards Update 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