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GOODWILL AND INTANGIBLE ASSETS - Goodwill (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Goodwill [Roll Forward]    
Balance, beginning of the year $ 665.7 $ 665.7
Acquisition of OHA 2,027.5 0.0
Balance, end of year $ 2,693.2 $ 665.7