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INVESTMENTS - Deconsolidation Impacts on Financial Statements (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Gains recognized upon deconsolidation | $ 284.6 | $ 496.5 | $ 540.3
Currency translation adjustments | Reclassification out of accumulated other comprehensive income |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Gains recognized upon deconsolidation | 2.4 | 0.7 | 0.1
Assets |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Net decrease in assets, liabilities, and redeemable noncontrolling interest | (753.0) | (546.1) | (380.5)
Liability |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Net decrease in assets, liabilities, and redeemable noncontrolling interest | (17.6) | (10.5) | (15.0)
Redeemable non-controlling interest |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Net decrease in assets, liabilities, and redeemable noncontrolling interest | $ (501.1) | $ (308.1) | $ (267.6)

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