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INVESTMENTS - Carrying Value of Investments (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Total	$ 2,503.6	$ 2,539.2
U.S. Treasury note
Schedule of Equity Method Investments [Line Items]
Held to maturity	1.0	1.0
Certificates of deposit
Schedule of Equity Method Investments [Line Items]
Held to maturity	17.4	9.2
Discretionary investments
Schedule of Equity Method Investments [Line Items]
Investments held at fair value	259.3	242.0
Equity method investments	3.7	199.6
Seed capital
Schedule of Equity Method Investments [Line Items]
Investments held at fair value	240.2	195.1
Equity method investments	82.5	125.7
Supplemental savings plan liability economic hedges
Schedule of Equity Method Investments [Line Items]
Investments held at fair value	698.4	760.7
Equity method investments	19.2	0.0
Investment partnerships and other investments
Schedule of Equity Method Investments [Line Items]
Investments held at fair value	75.5	87.1
Equity method investments	1.3	2.4
Investments in affiliated collateralized loan obligations
Schedule of Equity Method Investments [Line Items]
Investments held at fair value	7.6
Held to maturity	$ 102.5	$ 109.6
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	$ 170.0	$ 158.8
Investments in affiliated private investment funds - carried interest
Schedule of Equity Method Investments [Line Items]
Equity method investments	578.2	467.8
Investments in affiliated private investment funds - seed/co-investment
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 246.8	$ 173.8

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