INVESTMENTS - Carrying Value of Investments (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items]
Investment, Type [Extensible Enumeration]	Certificates of Deposit [Member]	Certificates of Deposit [Member]
Held to maturity	$ 44.7	$ 23.3
Total	3,000.5	2,554.7
Level 2 \| Fair value, measurements, recurring
Debt and Equity Securities, FV-NI [Line Items]
Investments in affiliated collateralized loan obligations	6.3	8.4
U.S. Treasury note
Debt and Equity Securities, FV-NI [Line Items]
Held to maturity	1.0	1.0
Discretionary investments
Debt and Equity Securities, FV-NI [Line Items]
Investments held at fair value	258.8	246.4
Equity method investments	60.8	5.3
Seed capital
Debt and Equity Securities, FV-NI [Line Items]
Investments held at fair value	262.8	247.8
Equity method investments	128.8	91.1
Deferred compensation liabilities economic hedges
Debt and Equity Securities, FV-NI [Line Items]
Investments held at fair value	992.8	806.6
Equity method investments	88.4	21.0
Investment partnerships and other investments
Debt and Equity Securities, FV-NI [Line Items]
Investments held at fair value	62.6	69.7
Equity method investments	162.1	2.2
Investment in UTI Asset Management Company Limited (India)
Debt and Equity Securities, FV-NI [Line Items]
Equity method investments	173.5	164.5
Investments in affiliated private investment funds - carried interest
Debt and Equity Securities, FV-NI [Line Items]
Equity method investments	426.9	519.9
Investments in affiliated private investment funds - seed/co-investment
Debt and Equity Securities, FV-NI [Line Items]
Equity method investments	269.9	253.4
Investments in affiliated collateralized loan obligations
Debt and Equity Securities, FV-NI [Line Items]
Held to maturity	$ 61.1	$ 94.1

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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Sum of the carrying amounts as of the balance sheet date of all investments.

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