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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, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Net increase (decrease) in assets of consolidated investment products | $ (181.4) | $ (236.4) | $ (604.1) | $ (271.8)
Net increase (decrease) in liabilities of consolidated investment products | (1.8) | (4.9) | (25.3) | (4.9)
Net increase (decrease) in redeemable non-controlling interests | $ (106.0) | $ (68.1) | $ (181.1) | $ (96.2)

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