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INVESTMENTS - Carrying Value of Investments (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Investment, Type [Extensible Enumeration] | Certificates of Deposit [Member] | Certificates of Deposit [Member]
Held to maturity | $ 50.4 | $ 44.7
Total | 3,359.9 | 3,000.5
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 | 719.0 | 258.8
Equity method investments | 20.2 | 60.8
Seed capital |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments held at fair value | 269.8 | 262.8
Equity method investments | 59.2 | 128.8
Deferred compensation liabilities economic hedges |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments held at fair value | 1,047.4 | 992.8
Equity method investments | 50.5 | 88.4
Investment partnerships and other investments |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments held at fair value | 78.8 | 62.6
Investments in affiliated collateralized loan obligations |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments held at fair value | 4.3 | 6.3
Held to maturity | 48.5 | 61.1
Investment in UTI Asset Management Company Limited (India) |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | 177.1 | 173.5
Investments in affiliated private investment funds - carried interest |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | 371.3 | 426.9
Investments in affiliated private investment funds - seed/co-investment |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | 290.6 | 269.9
Investment partnerships and other investments |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | $ 171.8 | $ 162.1

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