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INVESTMENTS - Carrying Value of Investments (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
Total | $ 2,539.2 | $ 2,975.5
Certificates of Deposit |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Held to maturity | 9.2 | 0.0
U.S. Treasury note |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Held to maturity | 1.0 | 1.0
Discretionary investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investments held at fair value | 242.0 | 518.7
Equity method investments | 199.6 | 0.0
Seed capital |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investments held at fair value | 195.1 | 264.8
Equity method investments | 125.7 | 141.7
Supplemental savings plan liability economic hedges |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investments held at fair value | 760.7 | 881.5
Investment partnerships and other investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Investments held at fair value | 87.1 | 108.9
Equity method investments | 2.4 | 2.5
Investments in affiliated collateralized loan obligations |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Held to maturity | 109.6 | 119.1
Investment in UTI Asset Management Company Limited (India) |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity method investments | 158.8 | 165.4
Investments in affiliated private investment funds - carried interest |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity method investments | 467.8 | 609.8
Investments in affiliated private investment funds - seed/co-investment |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity method investments | $ 173.8 | $ 151.3

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