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INVESTMENTS - Deconsolidation Impacts on Financial Statements (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Debt and Equity Securities, FV-NI [Line Items] |  |
Gains recognized upon deconsolidation | $ (198.5) | $ 102.1
Reclassification out of accumulated other comprehensive income | Currency translation adjustments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Gains recognized upon deconsolidation | 1.6 | 2.6
Assets |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | (97.5) | (928.1)
Liability |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | (8.6) | (15.3)
Redeemable noncontrolling interest |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | $ (63.0) | $ (739.9)

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