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INVESTMENTS - Deconsolidation Impacts on Financial Statements (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Net increase (decrease) in assets of consolidated sponsored investment products | $ (236.4) | $ (79.0) | $ (271.8) | $ (81.4)
Net increase (decrease) in liabilities of consolidated sponsored investment products | (4.9) | (33.0) | (4.9) | (33.1)
Net increase (decrease) in redeemable non-controlling interests | $ (68.1) | $ 5.9 | $ (96.2) | $ 5.9

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