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INVESTMENTS - Carrying Value of Investments (Details) - USD ($) $ in Millions | Sep. 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 | $ 32.5 | $ 23.3
Total | 2,966.0 | 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 | 261.0 | 246.4
Equity method investments | 60.9 | 5.3
Seed capital |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments held at fair value | 297.6 | 247.8
Equity method investments | 196.2 | 91.1
Supplemental savings plan liability economic hedges |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments held at fair value | 901.9 | 806.6
Equity method investments | 67.2 | 21.0
Investment partnerships and other investments |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments held at fair value | 105.7 | 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 | $ 80.6 | $ 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 | $ 166.3 | $ 164.5
Investments in affiliated private investment funds - carried interest |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | 499.7 | 519.9
Investments in affiliated private investment funds - seed/co-investment |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | 286.1 | 253.4
Investments in partnerships and other investments |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | $ 1.7 | $ 2.2

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