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INCOME TAXES - COMPONENTS OF TAX EXPENSE (BENEFIT) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Tax Disclosure [Abstract]        
Current tax expense (benefit) $ 22.8 $ 11.7 $ 36.8 $ (51.9)
Deferred tax expense 0.8 11.7 29.4 59.5
Income tax expense calculated based on estimated annual effective tax rate 23.6 23.4 66.2 7.6
Income tax benefit on discrete items:        
Carryback of net operating losses to years with a higher statutory corporate rate pursuant to provisions of the CARES Act (as defined below) 0.0 0.0 0.0 (34.0)
Total income tax expense (benefit) $ 23.6 $ 23.4 $ 66.2 $ (26.4)