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INVESTMENTS - Carrying Value of Investments (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Investment, Type [Extensible Enumeration]	Certificates of Deposit [Member]	Certificates of Deposit [Member]
Held to maturity	$ 29.6	$ 23.3
Total	2,758.9	2,554.7
U.S. Treasury note
Schedule of Equity Method Investments [Line Items]
Held to maturity	1.0	1.0
Discretionary investments
Schedule of Equity Method Investments [Line Items]
Investments held at fair value	245.9	246.4
Equity method investments	40.4	5.3
Seed capital
Schedule of Equity Method Investments [Line Items]
Investments held at fair value	260.3	247.8
Equity method investments	136.9	91.1
Supplemental savings plan liability economic hedges
Schedule of Equity Method Investments [Line Items]
Investments held at fair value	852.0	806.6
Equity method investments	40.6	21.0
Investment partnerships and other investments
Schedule of Equity Method Investments [Line Items]
Investments held at fair value	108.0	69.7
Investments in affiliated collateralized loan obligations
Schedule of Equity Method Investments [Line Items]
Investments held at fair value	7.6	8.4
Held to maturity	$ 81.8	$ 94.1
23% Investment in UTI Asset Management Company Limited (India)
Schedule of Equity Method Investments [Line Items]
Equity method investment (ownership percentage)	23.00%	23.00%
Equity method investments	$ 175.1	$ 164.5
Investments in affiliated private investment funds - carried interest
Schedule of Equity Method Investments [Line Items]
Equity method investments	497.3	519.9
Investments in affiliated private investment funds - seed/co-investment
Schedule of Equity Method Investments [Line Items]
Equity method investments	280.5	253.4
Investments in partnerships and other investments
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 1.9	$ 2.2

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