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INVESTMENTS - Deconsolidation Impacts on Financial Statements (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Net increase (decrease) in assets of consolidated sponsored investment products | $ (371.7) | $ (568.7) | $ (643.5) | $ (650.1)
Net increase (decrease) in liabilities of consolidated sponsored investment products | (14.6) | (10.4) | (19.5) | (43.5)
Net increase (decrease) in redeemable non-controlling interests | (160.6) | (466.1) | (256.8) | (460.2)
Gains recognized upon deconsolidation | 212.5 | 2.8 | 481.7 | 244.4
Reclassification out of accumulated other comprehensive income | Currency translation adjustments |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Gains recognized upon deconsolidation | $ (0.6) | $ 0.7 | $ (0.6) | $ 0.7

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