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INVESTMENTS - Disposals of Equity Securities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
INVESTMENTS    
Fair value at the time of sale of equity investment $ 4.3  
Cumulative net gain before tax on disposal of equity investment 5.9  
Cumulative net gain on disposal of equity investment $ 5.1  
Disposals of equity securities   $ 0.0