INVESTMENTS - Schedule of Carrying Value of Investments (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Debt and Equity Securities, FV-NI [Line Items]
Total	$ 4,090.2	$ 3,325.2
Certificates of deposit
Debt and Equity Securities, FV-NI [Line Items]
Held to maturity	50.4	50.4
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	954.0	463.7
Equity method investments	173.9	0.0
Redeemable seed capital investments
Debt and Equity Securities, FV-NI [Line Items]
Investments held at fair value	337.8	316.1
Equity method investments	9.3	8.3
Investments used to hedge the deferred compensation liabilities
Debt and Equity Securities, FV-NI [Line Items]
Investments held at fair value	1,286.4	1,243.3
Investment in UTI Asset Management Company Limited (India)
Debt and Equity Securities, FV-NI [Line Items]
Equity method investments	155.6	162.8
Investments in affiliated private investment funds - carried interest
Debt and Equity Securities, FV-NI [Line Items]
Equity method investments	381.1	390.3
Investments in affiliated private investment funds - seed/co-investment
Debt and Equity Securities, FV-NI [Line Items]
Equity method investments	370.1	304.7
Investment partnerships and other investments
Debt and Equity Securities, FV-NI [Line Items]
Investments held at fair value	98.2	157.9
Equity method investments	251.2	204.9
Investments in affiliated collateralized loan obligations
Debt and Equity Securities, FV-NI [Line Items]
Held to maturity	$ 21.2	$ 21.8

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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