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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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