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INVESTMENTS - Carrying Value of Investments (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Total | $ 2,480.2 | $ 2,975.5
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 | 1.0 | 0.0
Discretionary investments |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments held at fair value | 241.4 | 518.7
Equity method investments | 192.5 | 0.0
Seed capital |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments held at fair value | 177.1 | 264.8
Equity method investments | 154.9 | 141.7
Supplemental savings plan liability economic hedges |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments held at fair value | 669.5 | 881.5
Investment partnerships and other investments |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments held at fair value | 91.8 | 108.9
Equity method investments | 2.4 | 2.5
Investments in affiliated collateralized loan obligations |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments held at fair value | 6.4 | 10.8
Held to maturity | 100.2 | 119.1
Investments in affiliated private investment funds - carried interest |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | 508.3 | 609.8
Investments in affiliated private investment funds - seed/co-investment |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | $ 168.1 | $ 151.3
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 | $ 165.6 | $ 165.4

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