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INVESTMENTS - Deconsolidation Impacts on Financial Statements (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Net decrease in assets of consolidated investment products | $ (673.9) | $ (663.8) | $ (256.9)
Net decrease in liabilities of consolidated investment products | (20.5) | (29.7) | (12.8)
Net decrease in redeemable non-controlling interests | (272.8) | (479.2) | (147.2)
Gains recognized upon deconsolidation | 486.3 | 504.1 | (425.5)
Reclassification out of accumulated other comprehensive income | Currency translation adjustments |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Gains recognized upon deconsolidation | $ (0.4) | $ 0.0 | $ 3.0

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