Redemption of convertible debt, decrease in deferred income tax liabilities, net Debt Instrument, Convertible, Conversion Premium, Decrease In Deferred Income Tax Liabilities, Net Debt Instrument, Convertible, Conversion Premium, Decrease In Deferred Income Tax Liabilities, Net Dividends (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Beginning balance, accumulated amortization Ending balance, accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Decrease in controlling interest paid-in capital from Affiliate equity purchases Adjustments to Additional Paid in Capital Increase (Decrease) in Carrying Amount of Redeemable Noncontrolling Interests, Purchases The increase (decrease) in additional paid-in capital of the reporting entity from purchases and sales of Affiliate equity. Statistical Measurement [Domain] Statistical Measurement [Domain] Redeemable Noncontrolling Interest [Roll Forward] Redeemable Noncontrolling Interest [Roll Forward] -- None. No documentation exists for this element. -- Issuances Noncontrolling Interest, Increase (Decrease) From Issuance Of Interests Noncontrolling Interest, Increase (Decrease) From Issuance Of Interests Deferred payment obligations, liability, remainder of fiscal year Deferred Payment Obligations, Liability, Remainder Of Fiscal Year Deferred Payment Obligations, Liability, Remainder Of Fiscal Year Related Party Transaction [Axis] Related Party Transaction [Axis] Indefinite-lived Intangible Assets [Axis] Indefinite-Lived Intangible Assets [Axis] Estimated Future Amortization Expense of Finite-Lived Intangibles Finite-Lived Intangible Assets, Net, Amortization Expense, Rolling Maturity [Abstract] Entity File Number Entity File Number Additional Paid-In Capital Additional Paid-in Capital [Member] Investments in Affiliates Obligations And Payments To Acquire Interest In Subsidiaries And Affiliates Obligations And Payments To Acquire Interest In Subsidiaries And Affiliates Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Equity method income (net) Equity method income (net) Income (Loss) from Equity Method Investments Tax (Expense) Benefit Other Comprehensive Income (Loss), Tax Term of conditional right to put interest Term Of Conditional Right to Put Interest Term Of Conditional Right to Put Interest Maximum loss exposure for affiliates accounted for under the equity method Equity Method Investment, Reporting Entity Involvement, Maximum Loss Exposure, Amount Equity Method Investment, Reporting Entity Involvement, Maximum Loss Exposure, Amount Recent Accounting Developments New Accounting Pronouncements, Policy [Policy Text Block] Guarantor obligations, maximum exposure Guarantor Obligations, Maximum Exposure, Undiscounted 4.750% Junior Subordinated Notes due 2060 2060 Junior Subordinated Notes Four Point Seventy Five Junior Subordinated Notes Due 2060 [Member] Four Point Seventy Five Junior Subordinated Notes Due 2060 Contingent payments in year two Other Commitment, to be Paid, Year Two Measurement Basis [Axis] Measurement Basis [Axis] Earnings per share (basic) (in dollars per share) Earnings Per Share, Basic Related Party Transactions Related Party Transactions Disclosure [Text Block] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Financial Liabilities Liabilities, Fair Value Disclosure [Abstract] Discount rates Measurement Input, Discount Rate [Member] Other comprehensive loss, net of tax Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Measurement Input Type [Domain] Measurement Input Type [Domain] Affiliated Entity Affiliated Entity [Member] 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. (Increase) decrease in other assets Increase (Decrease) in Other Operating Assets Other Investments [Roll Forward] Other Investments [Roll Forward] Other Investments Investments in Affiliates and Affiliate Sponsored Investments Products Consolidation, Policy [Policy Text Block] 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 Purchases Noncontrolling Interest, Increase (Decrease) from Purchase of Interests Noncontrolling Interest, Increase (Decrease) from Purchase of Interests Intangible Assets by Major Class [Domain] Intangible Assets by Major Class [Domain] Intangible Assets by Major Class [Domain] Stock Options Share-Based Payment Arrangement, Option [Member] Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Dividends Dividends, Common Stock, Cash Total stockholders' equity Equity, Attributable to Parent Other Comprehensive Income (Loss), Net of Tax [Abstract] Other Comprehensive Income (Loss), Net of Tax [Abstract] Share-based compensation expense Share-Based Payment Arrangement, Expense Common stock, shares authorized (in shares) Common Stock, Shares Authorized Voting Rights Entities Voting Rights Entities [Member] Voting Rights Entities Senior notes Notes Payable, Fair Value Disclosure Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Controlling Interest Unrecognized Compensation Expenses Related to Affiliate Equity Attributable to Controlling Interest Unrecognized Compensation Expenses Related to Affiliate Equity Attributable to Controlling Interest Options forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period Total liabilities and equity Liabilities and Equity Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Junior Convertible Trust Preferred Securities Junior Convertible Trust Preferred Securities [Member] Represents the junior convertible trust preferred securities. Stock Options Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Liabilities and Equity Liabilities and Equity [Abstract] Cover [Abstract] Cover [Abstract] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Maximum Maximum [Member] 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 Schedule of Equity Method Investments [Table] Equity Method Investment [Table] Net income (non-controlling interests) Net Income (Loss) Attributable to Noncontrolling Interest Schedule of Other Financial Assets and 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] Accounting Policies [Abstract] Accounting Policies [Abstract] Beginning balance, net carrying value Ending balance, net carrying value Finite-Lived Intangible Assets, Net Debt Instrument [Line Items] Debt Instrument [Line Items] 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) NAV of investments at fair value Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Treasury Stock at Cost Treasury Stock, Common [Member] Restricted stocks granted, fair value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Changes in redemption value of Redeemable non-controlling interests Changes in redemption value Redeemable Noncontrolling Interest, Equity, Change In Redemption Value Increase (decrease) in redeemable non-controlling interests during the period as a result of a change in the redemption value. Downward adjustments Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Annual Amount On or after March 30, 2029 Debt Instrument, Redemption, Period One [Member] Affiliate Equity Purchase Obligations Obligations to Related Parties [Member] Represents the obligations of the entity towards related parties. Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Equity method investment, undistributed earnings Equity Method Investment, Undistributed Earnings Equity Method Investment, Undistributed Earnings Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Increase attributable to consolidated Affiliate sponsored investment products Noncontrolling Interest, Increase (decrease) Attributable to Consolidated Partnerships Noncontrolling Interest, Increase (decrease) Attributable to Consolidated Partnerships Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Schedule of Variable Interest Entities [Table] Variable Interest Entity [Table] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Comprehensive income (non-controlling interests) Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Interest expense Interest Expense, Operating Comprehensive income (controlling interest) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Options expired (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Measurement Input Type [Axis] Measurement Input Type [Axis] Affiliate equity purchase obligations Due To Related Parties, Fair Value Disclosure Due To Related Parties, Fair Value Disclosure 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. Schedule of Changes in Level 3 Assets and Liabilities for Affiliate Equity Repurchase Obligation Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Definite-lived Finite-Lived Intangible Assets [Roll Forward] Deferred tax liability (net) Deferred Income Tax Liabilities, Net Document Fiscal Period Focus Document Fiscal Period Focus Senior bank debt Unsecured Debt [Member] Equity Securities Without Readily Determinable Fair Value [Roll Forward] Equity Securities Without Readily Determinable Fair Value [Roll Forward] Equity Securities Without Readily Determinable Fair Value Award Type [Axis] Award Type [Axis] Transfers to Other liabilities Noncontrolling Interest, Decrease from Transfers to Other Liabilities Noncontrolling Interest, Decrease from Transfers to Other Liabilities Parent Company Parent Company [Member] Schedule of Tax Effects Allocated to Each Component of Other Comprehensive Income (Loss) Comprehensive Income (Loss) [Table Text Block] Debt Debt Long-Term Debt Legal Entity [Axis] Legal Entity [Axis] Earnings, net of tax Income (Loss) from Equity Method Investments Before Amortization of Intangibles Income (Loss) from Equity Method Investments Before Amortization of Intangibles Total assets Assets Investment, Name [Domain] Investment, Name [Domain] Intangible future amortization expense in year one Finite-Lived Intangible Asset, Expected Amortization, Year One Trading Symbol Trading Symbol Units vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Commitment and Contingencies [Table] Commitment and Contingencies [Table] Represents commitments and contingencies of the entity. Entity Address, City or Town Entity Address, City or Town Debt securities Debt Securities Cash flow from (used in) operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Marketable Securities [Line Items] Marketable Securities [Line Items] Debt securities, net unrealized gain (loss) Debt Securities, Trading, Unrealized Gain (Loss) Effect of foreign currency exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Restricted Stock Units Restricted Stock Units (RSUs) [Member] Financial Assets Assets, Fair Value Disclosure [Abstract] Impairment expense Equity Method Investment, Other-than-Temporary Impairment Intangible future amortization expense in year four Finite-Lived Intangible Asset, Expected Amortization, Year Four Variable Interest Entities Variable Interest Entity [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Commitments and Contingencies Commitment and Contingencies [Line Items] -- None. No documentation exists for this element. -- Total other investments Balance, beginning of period Balance, end of period Other Investments Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding 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 Debt issuance costs Debt Issuance Costs, Net Significant Other Observable Inputs (Level 2) Level 2 Fair Value, Inputs, Level 2 [Member] Contingent payments in year three Other Commitment, to be Paid, Year Three Affiliate Equity [Table] Affiliate Equity [Table] Affiliate Equity [Table] Equity method investments Equity Method Investments Beginning balance, carrying value Ending balance, carrying value Carrying value of intangible assets Indefinite-Lived Intangible Assets (Excluding Goodwill) Schedule of Investments without Readily Determinable Fair Value Equity Securities without Readily Determinable Fair Value [Table Text Block] Related Party Related Party [Member] Schedule of Investments in Marketable Securities Marketable Securities [Table Text Block] Document Information [Table] Document Information [Table] Contingent payments in remainder of fiscal year Other Commitment, to be Paid, Remainder of Fiscal Year Foreign currency translation, gross carrying 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 Fair value Debt Securities, Trading Maturities and sales of investment securities Proceeds from Sale, Maturity and Collection of Investments Guarantor obligations, fair value Guarantor Obligations, Fair Value Guarantor Obligations, Fair Value 2030 Senior Notes Senior Notes Three Point Three Zero Percent Due 2030 [Member] Senior Notes Three Point Three Zero Percent Due 2030 Borrowings of senior bank debt Proceeds from Issuance of Senior Long-Term Debt Junior subordinated notes Junior Subordinated Debt [Member] Changes in assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] APIC, decrease from conversion premium Adjustment To Additional Paid-In Capital, Convertible Debt Instrument, Decrease From Conversion Premium Adjustment To Additional Paid-In Capital, Convertible Debt Instrument, Decrease From Conversion Premium Sales and distributions Other Investments, Sales Other Investments, Sales Purchases and commitments funded Equity Securities Without Readily Determinable Fair Value, Purchases And Commitments Equity Securities Without Readily Determinable Fair Value, Purchases And Commitments Unrealized losses Debt Securities, Trading, Accumulated Gross Unrealized Loss, Before Tax Debt Securities, Trading, Accumulated Gross Unrealized Loss, Before Tax Retained Earnings Retained Earnings [Member] Payables and accrued liabilities Accounts Payable and Accrued Liabilities Impairment assessment assumptions, revenue growth rates Impairment Assessment Assumptions, Revenue Growth Rates Impairment Assessment Assumptions, Revenue Growth Rates Restricted Stock Units Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Income tax expense Income tax expense Income Tax Expense (Benefit) Basis spread on debt variable rate Debt Instrument, Basis Spread on Variable Rate Purchases of investment securities Payments to Acquire Marketable Securities Other assets Other Assets Document Information [Line Items] Document Information [Line Items] Acquired client relationships (net) Beginning balance, carrying value Ending balance, carrying value Intangible Assets, Net (Excluding Goodwill) 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. Interest expense on junior convertible securities, net of taxes Interest on Convertible Debt, Net of Tax Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Change in net realized and unrealized gain (loss) on derivative financial instruments Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Interest expense, excluding amortization Interest Expense, Debt, Excluding Amortization Variable Interest Entities Variable Interest Entities [Abstract] -- None. No documentation exists for this element. -- Controlling Interest Parent [Member] Net income Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] City Area Code City Area Code Unrecognized Affiliate Equity Expense [Abstract] Unrecognized Affiliate Equity Expense [Abstract] Unrecognized Affiliate Equity Expense [Abstract] Redemption price percentage Debt Instrument, Redemption Price, Percentage Income Tax Provision Income Tax [Line Items] -- None. No documentation exists for this element. -- 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 Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Forward sale contract expense Forward Sale Contract, Expense Forward Sale Contract, Expense Cash flow from (used in) investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Cash flow from operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Related Party Transactions [Abstract] Related Party Transactions [Abstract] Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Equity securities Fair value Equity Securities, FV-NI Other liabilities Other Liabilities Goodwill Beginning balance Ending balance Goodwill Contingent Payment Obligations Contingent Payment Arrangements [Member] Contingent Payment Arrangements Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Net realized and unrealized (losses) gains on investment securities Gain (Loss) on Investments If a rating agency makes certain changes relating to the equity credit criteria for securities Debt Instrument, Redemption, Period Three [Member] Intangible future amortization expense remainder of fiscal year Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Equity Components [Axis] Equity Components [Axis] Convertible Debt Convertible Debt [Member] Contingent payments in year one Other Commitment, to be Paid, Year One Stock options and restricted stock units Employee Stock Options and Restricted Stock [Member] Employee Stock Options and Restricted Stock [Member] Options expired (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period Weighted Average Exercise Price Per Option Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Entity Address, State or Province Entity Address, State or Province Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] 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. Foreign currency translation, accumulated depreciation Finite Lived Intangible Asset, Accumulated Amortization, Foreign Currency Translation Finite Lived Intangible Asset, Accumulated Amortization, Foreign Currency Translation Gain (Loss) Related Party [Domain] Related and Nonrelated Parties [Domain] 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. 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. Additional paid-in capital Additional Paid in Capital, Common Stock Entity [Domain] Entity [Domain] Cash flow used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity method investments in Affiliates (net) Carrying value of equity method investment in affiliate Balance, as of December 31, 2025 Balance, as of March 31, 2026 Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Document Fiscal Year Focus Document Fiscal Year Focus Maximum loss exposure attributable to affiliate sponsored investment products Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Effective tax rate (controlling interests) Effective Income Tax Rate Reconciliation, Percent Entity Interactive Data Current Entity Interactive Data Current Carrying Value Reported Value Measurement [Member] Increase in payables, accrued liabilities, and other liabilities Increase (Decrease) in Operating Liabilities Unrecognized share-based compensation expense, period for recognition Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Options exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Cumulative unrealized gains Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount 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 Segment Information Segment Reporting Disclosure [Text Block] Contingent payments in year four Other Commitment, to be Paid, Year Four Total marketable securities Marketable Securities Fair value of financial assets and liabilities Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] 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). Affiliate equity purchase obligations Due to Related Parties, Fair Value Disclosure Due to Related Parties, Fair Value Disclosure Comprehensive Income Comprehensive Income (Loss) Note [Text Block] Weighted Average Weighted Average [Member] Monte Carlo simulation Valuation Technique, Monte Carlo Simulation [Member] Monte Carlo Valuation Technique Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Intangible amortization and impairments Amortization and impairment expenses of intangible assets Amortization of intangible assets Amortization of Intangible Assets Selling, general and administrative Selling, General and Administrative Expense Volatility Measurement Input, Price Volatility [Member] Shares issuable to settle Redeemable non-controlling interests Shares Issuable to Settle Redeemable Non-Controlling Interests [Member] Shares Issuable to Settle Redeemable Non-Controlling Interests Schedule of Components of Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Net realized and unrealized gains Other Investments, Gain (Loss), Net Other Investments, Gain (Loss), Net Cost Debt Securities, Trading, Amortized Cost Entity Central Index Key Entity Central Index Key Schedule of Principal Terms of Senior and Junior Subordinated Notes Schedule of Maturities of Long-Term Debt [Table Text Block] Controlling interest Income Tax Expense (Benefit), Controlling Interest Income Tax Expense (Benefit), Controlling Interest Proceeds from affiliate equity issuances Proceeds From Affiliate Equity Issuances Proceeds From Affiliate Equity Issuances Fair Value, Balance Sheet Grouping, Financial Statement Captions Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Junior convertible securities (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Investments in Affiliates Payments to Acquire Interest in Subsidiaries and Affiliates 6.750% Junior Subordinated Notes due 2064 2064 Junior Subordinated Notes Six Point Seventy Five Junior Subordinated Notes Due 2064 [Member] Six Point Seventy Five Junior Subordinated Notes Due 2064 Balance, beginning of period Balance, end of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value 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 Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Entity Filer Category Entity Filer Category Local Phone Number Local Phone Number Class of Stock [Domain] Class of Stock [Domain] Share-Based Compensation Share-Based Payment Arrangement [Text Block] Maximum loss exposure attributable to affiliates accounted for under equity method Variable Interest Entity, Nonconsolidated, Comparison of Carrying Amount of Assets and Liabilities to Maximum Loss Exposure Assets Assets [Abstract] Intangible future amortization expense in year three Finite-Lived Intangible Asset, Expected Amortization, Year Three Other Commitments [Axis] Other Commitments [Axis] Debt Instrument [Axis] Debt Instrument [Axis] 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 Fair Value Measurements Fair Value Disclosures [Text Block] Beginning balance, gross carrying value Ending balance, gross carrying value Finite-Lived Intangible Assets, Gross Entity Address, Address Line One Entity Address, Address Line One Share repurchases, inclusive of excise tax Treasury Stock, Value, Acquired, Cost Method Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Stated coupon Debt interest rate Debt Instrument, Interest Rate, Stated Percentage Investment, Name [Axis] Investment, Name [Axis] Investment Type Categorization [Domain] Investments [Domain] Investments in debt securities Debt Securities, Trading and Available-for-Sale Redeemable non-controlling interests Balance, beginning balance Balance, ending balance Redeemable Noncontrolling Interest, Equity, Carrying Amount Deferred tax liabilities, recapture of excess interest expense Deferred Tax Liabilities, Recapture Of Excess Interest Expense In Year One Deferred Tax Liabilities, Recapture Of Excess Interest Expense In Year One Deferred payment obligation Deferred Payment Obligations, Liability Deferred Payment Obligations, Liability Revolver Senior Unsecured Credit Facility Revolver [Member] Senior Unsecured Credit Facility Revolver Cost Equity Securities, FV-NI, Cost Receivables Accounts Receivable, after Allowance for Credit Loss Entity Registrant Name Entity Registrant Name Conversion premium on junior convertible securities Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt Weighted Average Remaining Contractual Life (Years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Life [Abstract] -- None. No documentation exists for this element. -- Affiliate Tax Distributions Affiliate Tax Distributions [Member] Affiliate Tax Distributions Schedule of Debt Schedule of Long-Term Debt Instruments [Table Text Block] Compensation and related expenses Labor and Related Expense Stock options and restricted stock units (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Units granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Units forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Unrecognized share-based compensation expense Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Related Party Transactions Related Party Transaction [Line Items] If changes in tax laws and interpretations occur Debt Instrument, Redemption, Period Two [Member] Document Quarterly Report Document Quarterly Report Schedule of Quantitative Information used in Valuing Level 3 Liabilities Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Affiliate equity-related activities: Affiliate Equity [Abstract] Affiliate Equity [Abstract] Investments without readily determinable fair values Carrying amount Balance, beginning of period Balance, end of period Equity Securities without Readily Determinable Fair Value, Amount Number of operating segments Number of Operating Segments 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 Repayments of junior convertible securities Repayments of Convertible Debt Investment Type [Axis] Investment Type [Axis] 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 Related Party [Axis] Related and Nonrelated Parties [Axis] Investments Investments Affiliate equity purchases, net Payments For Affiliate Equity Issuances And Repurchases, Net The net cash inflow (outflow) resulting from the affiliate share transaction. Common stock issued under share-based incentive plans Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Other financing items Proceeds from (Payment for) Other Financing Activity Interest expense Interest Expense, Debt Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) [Line Items] Unfunded commitments, structures yet to be determined Fair Value, Investments, Structure Yet To Be Determined, Unfunded Commitments Fair Value, Investments, Structure Yet To Be Determined, Unfunded Commitments Amounts reclassified Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Award Type [Domain] Award Type [Domain] 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 Other non-cash items Other Noncash Income (Expense) Life of funds (generally up to) Fair Value, Investments, Entities That Calculate NAVs, Life of Fund Fair Value, Investments, Entities That Calculate NAVs, Life of Fund Par value Debt Instrument, Face Amount 2036 Senior Notes Senior Notes Five Point Five Zero Percent Due 2036 [Member] Senior Notes Five Point Five Zero Percent Due 2036 Schedule of Company Stock Option Transactions Share-Based Payment Arrangement, Activity [Table Text Block] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Net realized and unrealized gains Equity Securities Without Readily Determinable Fair Value, Net Gain (Loss) Equity Securities Without Readily Determinable Fair Value, Net Gain (Loss) Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Fair Value Estimate of Fair Value Measurement [Member] Purchases of securities by consolidated Affiliate sponsored investment products Purchases of Securities by Affiliate Sponsored Consolidated Products Purchases of Securities by Affiliate Sponsored Consolidated Products Non-controlling interests Income Tax Expense (Benefit), Non-Controlling Interest Income Tax Expense (Benefit), Non-Controlling Interest Intangible amortization and impairments Equity Method Investment, Intangible Asset Amortization and Impairments Equity Method Investment, Intangible Asset Amortization and Impairments Components of Accumulated other comprehensive income, net of taxes AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] 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 Redemption price percentage, triggering events Debt Instrument, Redemption Price, Percentage, Triggering Events Debt Instrument, Redemption Price, Percentage, Triggering Events Amortization of intangible assets, noncontrolling interest Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill), Controlling Interest Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill), Controlling Interest Total contingent payments Other Commitment Investments measured at NAV as a practical expedient Fair Value Alternative Investment Share-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Additional borrowing amount Line of Credit Facility, Maximum Borrowing Capacity, Additional Amount Line of Credit Facility, Maximum Borrowing Capacity, Additional Amount Contingent payment obligations, measurement input Contingent Consideration, Liability, Measurement Input Contingent Consideration, Liability, Measurement Input Change in net unrealized gain (loss) on available-for-sale debt securities OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax Total AOCI Including Portion Attributable to Noncontrolling Interest [Member] Liability Class [Axis] Liability Class [Axis] Unrealized gains Debt Securities, Trading, Accumulated Gross Unrealized Gain Before Tax Debt Securities, Trading, Accumulated Gross Unrealized Gain Before Tax Investments Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Hypothetical issuance of shares to settle Redeemable non-controlling interests (in shares) Settlement of Redeemable Non-Controlling Interests, Shares Issued Settlement of Redeemable Non-Controlling Interests, Shares Issued Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Minimum Minimum [Member] Purchases and commitments funded Other Investments, Purchases Other Investments, Purchases Performance condition changes (in shares) Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Period Increase (Decrease), Performance Condition Changes Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Period Increase (Decrease), Performance Condition Changes Fair Value Measurement [Domain] Fair Value Measurement [Domain] Senior notes Senior Notes [Member] Debt Debt Disclosure [Text Block] Intangible Assets Intangible Asset [Line Items] -- None. No documentation exists for this element. -- Trading Debt Securities, Trading, and Equity Securities, FV-NI [Abstract] Pre-Tax Other Comprehensive Income (Loss), before Tax Schedule of Other 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. Net income (controlling interest), as adjusted Net Income (Loss) Available to Common Stockholders, Diluted Contingent payments in year five Other Commitment, to be Paid, Year Five Repayments of senior bank debt Repayments of Senior Debt Common stock ($0.01 par value, 153.0 shares authorized; 58.5 shares issued as of December 31, 2025 and March 31, 2026) Common Stock, Value, Issued Growth rates Measurement Input, Long-Term Revenue Growth Rate [Member] Goodwill [Roll Forward] Goodwill [Roll Forward] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Repayments of convertible debt, including conversion payment Repayments Of Convertible Debt, Including Conversion Payment Repayments Of Convertible Debt, Including Conversion Payment Share-based compensation and Affiliate equity expense Share-Based Compensation And Affiliate Equity Expense Share-Based Compensation And Affiliate Equity Expense Average shares outstanding (diluted) (in shares) Average shares outstanding (diluted) (in shares) Weighted Average Number of Shares Outstanding, Diluted Commitments and contingencies (Note 7) Commitments and Contingencies Stock options granted, fair value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value Fair Value Measured at NAV Fair Value Measured at Net Asset Value Per Share [Member] Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Entity Small Business Entity Small Business Number of affiliates Number Of Affiliates, Equity Method Investment Number Of Affiliates, Equity Method Investment Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Schedule of Company Restricted Stock Units Transactions Schedule of Nonvested Share Activity [Table Text Block] Non- controlling Interests Noncontrolling Interest [Member] Document Transition Report Document Transition Report 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 Accounting Standards and Policies Accounting Standards Update and Change in Accounting Principle [Text Block] Numerator Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Noncontrolling Interest [Table] Noncontrolling Interest [Table] Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date Income Taxes Income Tax Disclosure [Text Block] Foreign currency translation Equity Method Investment, Realized Gain (Loss) on Foreign Currency Translation Equity Method Investment, Realized Gain (Loss) on Foreign Currency Translation Schedule of Changes in the Components of Acquired Client Relationships Schedule of Intangible Assets by Major Class [Table Text Block] Tabular disclosure of intangibles assets, in total and by major class, including the gross carrying amount and accumulated amortization. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. Exercisable at the end of the period Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Total equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Average price of shares repurchased during period (in dollars per share) Shares Acquired, Average Cost Per Share Total Intangible Assets [Roll Forward] -- None. No documentation exists for this element. -- Controlling interest Compensation Expenses Related to Affiliate Equity Represents the compensation expenses related to Affiliate equity. Document Type Document Type Affiliate equity purchases, gross Payments For Affiliate Equity Issuances And Repurchases, Gross Payments For Affiliate Equity Issuances And Repurchases, Gross Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Earnings Per Share Earnings Per Share [Text Block] Marketable Securities [Table] Marketable Securities [Table] Investments With Periodic Liquidity Investments With Periodic Liquidity [Member] Investments With Periodic Liquidity Consolidated revenue Revenue from Contract with Customer, Excluding Assessed Tax Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Increase in receivables Increase (Decrease) in Receivables Purchases of fixed assets Payments to Acquire Property, Plant, and Equipment Stock options, expiration period Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Statistical Measurement [Axis] Statistical Measurement [Axis] Deferred payment obligations, to be paid, year one Deferred Payment Obligations, To Be Paid, Year One Deferred Payment Obligations, To Be Paid, Year One Weighted average interest rate on outstanding borrowings Debt, Weighted Average Interest Rate Fair value of deconsolidated investment in affiliate, equity securities Equity Securities, Fair Value, Consolidation Equity Securities, Fair Value, Consolidation Impairment assessment assumptions, long-term revenue growth rates Impairment Assessment Assumptions, Long-Term Revenue Growth Rates Impairment Assessment Assumptions, Long-Term Revenue Growth Rates Quantitative information for Level 3 Fair Value Measurements Liabilities Fair Value Measurement Inputs and Valuation Techniques [Line Items] Foreign currency translation Goodwill, Foreign Currency Translation, Gain (Loss) Equity Method Investee Equity Method Investee [Member] Schedule of Affiliate Equity Unrecognized Compensation Expense Summary of Affiliate Equity Unrecognized Compensation Expense [Table Text Block] Summary of Affiliate Equity Unrecognized Compensation Expense [Table Text Block] Net income (controlling interest) Net Income (Loss) Available to Common Stockholders, Basic Investments With Limited Liquidity Investments With Limited Liquidity [Member] Investments With Limited Liquidity Total consolidated expenses Operating Expenses Borrowings outstanding Long-Term Line of Credit Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Indefinite-lived Indefinite-Lived Intangible Assets [Roll Forward] Schedule of Related Party Transactions, by Related Party [Table] Related Party Transaction [Table] Earnings per share (diluted) (in dollars per share) Earnings Per Share, Diluted 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. Title of 12(b) Security Title of 12(b) Security Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Impairment assessment assumptions, discount rates Impairment Assessment Assumptions, Discount Rates Impairment Assessment Assumptions, Discount Rates APIC, increase from conversion of convertible debt Adjustment To Additional Paid-In Capital, Convertible Debt Instrument, Increase From Conversion Adjustment To Additional Paid-In Capital, Convertible Debt Instrument, Increase From Conversion Treasury stock, at cost (in shares) Treasury Stock, Common, Shares Earnings Per Share [Abstract] Earnings Per Share [Abstract] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Equity Method Investments in Affiliates Equity Method Investments and Joint Ventures Disclosure [Text Block] Unrealized losses Equity Securities, FV-NI, Unrealized Loss Non-controlling Interests Affiliate Equity Unrecognized Compensation Expense, Attributable to Noncontrolling Interest Affiliate Equity Unrecognized Compensation Expense, Attributable to Noncontrolling Interest Schedule of Shares Excluded from Calculation of Basic and Diluted Earnings (Loss) Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Intangible amortization and impairments Intangible amortization and impairments Amortization and Impairments of Intangible Assets Amortization and Impairments of Intangible Assets Noncontrolling Interest [Abstract] Noncontrolling Interest [Abstract] Effect of dilutive instruments: Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract] Number or shares repurchased during period (in shares) Treasury Stock, Shares, Acquired Options exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Affiliate equity compensation expense Affiliate Equity Compensation Expense, Including Portion Attributable to Noncontrolling Interest Affiliate Equity Compensation Expense, Including Portion Attributable to Noncontrolling Interest Intangible future amortization expense in year two Finite-Lived Intangible Asset, Expected Amortization, Year Two Total carrying value Long-Term Debt, Gross Options granted (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Investments measured at NAV Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments Other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Distributions to non-controlling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Investments Investments In Marketable And Debt Securities, And Other Investments Investments In Marketable And Debt Securities, And Other Investments Effective interest rate Debt Instrument, Interest Rate During Period Net income (controlling interest) Net income (controlling interest) Net Income (Loss) Attributable to Parent Other Commitments [Domain] Other Commitments [Domain] 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 Intangible future amortization expense in year five Finite-Lived Intangible Asset, Expected Amortization, Year Five 4.200% Junior Subordinated Notes due 2061 2061 Junior Subordinated Notes Four Point Two Junior Subordinated Notes Due 2061 [Member] Four Point Two Junior Subordinated Notes Due 2061 Equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Equity securities, net unrealized gain Equity Securities, FV-NI, Unrealized Gain (Loss) Stock options, vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Foreign currency translation Indefinite-Lived Intangible Assets, Foreign Currency Translation Gain (Loss) Schedule of Changes in Equity Method Investments in Affiliates Equity Method Investments [Table Text Block] Fixed assets (net) Property, Plant and Equipment, Net Repurchases of common stock, net Payments for Repurchase of Common Stock Reclassification Reclassification, Comparability Adjustment [Policy Text Block] Applicable basis spread over redemption price percentage Debt Instrument, Make Whole Premium, Discount Rate, Basis Spread on Variable Rate Debt Instrument, Make Whole Premium, Discount Rate, Basis Spread on Variable Rate Conversion premium, liability Debt Instrument, Convertible, Conversion Premium, Liability Debt Instrument, Convertible, Conversion Premium, Liability Entity Current Reporting Status Entity Current Reporting Status Acquired Client Relationships Customer Relationships [Member] Consolidated Entities [Domain] Consolidated Entities [Domain] Change in net unrealized gain (loss) on available-for-sale debt securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Including Noncontrolling Interest [Member] Retained earnings Retained Earnings (Accumulated Deficit) Debt instrument, conversion reference period Debt Instrument, Conversion Reference Period Debt Instrument, Conversion Reference Period Schedule of Share-Based Compensation Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Foreign currency translation loss Foreign Currency Translation Adjustment Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Common stock, voting rights, percent Common Stock, Voting Rights, Percent Common Stock, Voting Rights, Percent 2034 Senior Notes Senior Notes Five Point Five Zero Percent Due 2034 [Member] Senior Notes Five Point Five Zero Percent Due 2034 Intangible Assets by Major Class [Axis] Intangible Assets by Major Class [Axis] Intangible Assets by Major Class Intangible amortization and impairments Intangible impairment Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill) Other expenses (net) Other Operating Income (Expense), Net Other comprehensive loss, net of tax: Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Net income (controlling interest) including the net impact of Affiliate equity transactions Increase (Decrease) in Equity Due to Profit (Loss) and Net Transfers with Noncontrolling Interests Increase (decrease) in equity during the period due to net income attributable to the parent company and net transfers with non-controlling interests. Schedule of Affiliate Equity Compensation Summary of Affiliate Equity Compensation [Table Text Block] Summary of Affiliate Equity Compensation [Table Text Block] Current Fiscal Year End Date Current Fiscal Year End Date Class of Stock [Axis] Class of Stock [Axis] Redemption of convertible debt, securities not converted, amount Redemption Of Convertible Debt, Securities Not Converted, Amount Redemption Of Convertible Debt, Securities Not Converted, Amount Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] 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. Weighted Average Grant Date Value Per Unit Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Statement [Table] Statement [Table] Non-controlling interests Other Noncontrolling Interests 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. Deferred income tax expense (benefit) Deferred Income Tax Expense (Benefit) Adjustments to reconcile Net income to cash flow from (used in) operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Cash flow from (used in) financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Redeemable Non-Controlling Interests Noncontrolling Interest Disclosure [Text Block] Cost Equity Securities Without Readily Determinable Fair Value, Cost Equity Securities Without Readily Determinable Fair Value, Cost Distributions received from equity method investments Distributions of earnings Proceeds from Equity Method Investment, Distribution Schedule of Fair Value of Assets and Liabilities Measured on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Basis of Presentation and Use of Estimates Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Capital contributions and other Noncontrolling Interest, Increase (Decrease) from Contributions from Affiliate and Other Noncontrolling Interest, Increase (Decrease) from Contributions from Affiliate and Other Antidilutive securities excluded from computation of earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Denominator Weighted Average Number of Shares Outstanding, Diluted [Abstract] 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] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Amendment Flag Amendment Flag Tax benefit Share-Based Payment Arrangement, Expense, Tax Benefit Non-controlling interests Affiliate Equity Compensation Expense, Attributable to Noncontrolling Interest Affiliate Equity Compensation Expense, Attributable to Noncontrolling Interest 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 Less: Treasury stock, at cost (31.5 shares and 32.0 shares as of December 31, 2025 and March 31, 2026, respectively) Treasury Stock, Common, Value Cash flow used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Acquired Client Relationships For Certain Mutual Fund Assets Acquired Client Relationships For Certain Mutual Fund Assets [Member] Acquired Client Relationships For Certain Mutual Fund Assets Junior subordinated notes Subordinated Debt Obligations, Fair Value Disclosure Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Average shares outstanding (basic) (in shares) Weighted Average Number of Shares Outstanding, Basic Remaining Life Affiliate Equity, Unrecognized Compensation Expense, Remaining Life Affiliate Equity, Unrecognized Compensation Expense, Remaining Life Schedule of Basic and Diluted Earnings (Loss) Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Coinvestor Coinvestor [Member] Coinvestor Stock Options, Exercisable at the end of the period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Related Party Transaction [Domain] Related Party Transaction [Domain] Segment Reporting [Abstract] Segment Reporting [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Amortization of debt issuance cost Amortization of Debt Issuance Costs Entity Tax Identification Number Entity Tax Identification Number Acquired Client Relationships, Mutual Fund Product Acquired Client Relationships, Mutual Fund Product [Member] Acquired Client Relationships, Mutual Fund Product Discounted cash flow Valuation Technique, Discounted Cash Flow [Member] Unrealized gains Equity Securities, FV-NI, Unrealized Gain Private Equity Investment Partnerships of Affiliate Private Equity Investment Partnerships of Affiliate [Member] Private Equity Investment Partnerships of Affiliate [Member] Unexercised options outstanding - beginning balance (in dollars per share) Unexercised options outstanding - ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Change in net realized and unrealized gain (loss) on derivative financial instruments Realized and Unrealized Gains (Losses) on Derivative Financial Instruments Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member] Share-based Compensation Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Consolidated Entities [Axis] Consolidated Entities [Axis] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares issued (in shares) Common Stock, Shares, Issued Effect of consolidation of Affiliate sponsored investment products Reduction To Cash Due To Deconsolidation Affiliates and Affiliate Sponsored Investment Products Reduction To Cash Due To Deconsolidation Affiliates and Affiliate Sponsored Investment Products Affiliate Equity [Line Items] Affiliate Equity [Line Items] [Line Items] for Affiliate Equity [Table] Schedule of Changes in Redeemable Non-Controlling Interests Redeemable Noncontrolling Interest [Table Text Block] Options granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Goodwill and Acquired Client Relationships Goodwill and Intangible Assets Disclosure [Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Affiliate equity expense Affiliate Equity Expense, Including Adjustments And Portion Attributable To Noncontrolling Interest Affiliate Equity Expense, Including Adjustments And Portion Attributable To Noncontrolling Interest Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table] Junior convertible securities Convertible Debt Securities [Member] Schedule of Changes in Goodwill Schedule of Goodwill [Table Text Block] Net realized and unrealized (gains) losses Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Upward adjustments Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount Conversion payments on junior convertible securities Conversion Payments On Junior Convertible Securities Conversion Payments On Junior Convertible Securities Foreign currency translation loss Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Security Exchange Name Security Exchange Name Deferred income tax (benefit) expense related to intangibles Deferred Income Tax (Benefit) 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. Options forfeited (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Total liabilities Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Distributions to non-controlling interests Distributions to non-controlling interests Payments of Ordinary Dividends, Noncontrolling Interest Increase (decrease) in controlling interest paid-in capital from Affiliate equity issuances Adjustments to Additional Paid in Capital Increase (Decrease) in Carrying Amount of Redeemable Noncontrolling Interests, Issuances Adjustments to Additional Paid in Capital Increase (Decrease) in Carrying Amount of Redeemable Noncontrolling Interests, Issuances Loss from hypothetical settlement of Redeemable non-controlling interests, net of taxes Net Income (Loss) Other Noncontrolling Interests, Redeemable Net Income (Loss) Other Noncontrolling Interests, Redeemable Available borrowing Line of Credit Facility, Maximum Borrowing Capacity Contingent payment obligations Fair value of contingent payment obligations Contingent Consideration, Liability Contingent Consideration, Liability Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-Lived Intangible Assets, Major Class Name [Domain] Obligations to related parties, measurement input Due To Related Parties, Measurement Input Due To Related Parties, Measurement Input Sales and distributions Equity Securities Without Readily Determinable Fair Value, Sales And Distributions Equity Securities Without Readily Determinable Fair Value, Sales And Distributions Consolidated expenses: Operating Expenses [Abstract] Income Tax Provision [Table] Income Tax Provision [Table] Schedule reflecting information of income tax attributable to controlling and noncontrolling interests. 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. Statement Statement [Line Items] Cash and cash equivalents Cash and Cash Equivalent Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Common Stock ($0.01 par value) Common Stock Common Stock [Member] Units vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Total stockholders' equity before treasury stock Stockholders' Equity before Treasury Stock Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Net decrease in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Payments for Achievement of Financial Targets Payments For Achievement Of Financial Targets [Member] Payments For Achievement Of Financial Targets [Member]