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INCOME TAXES - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 4 Months Ended 5 Months Ended 9 Months Ended
May 01, 2019
Sep. 30, 2020
May 01, 2019
Sep. 30, 2019
Sep. 30, 2020
Income Tax Disclosure [Abstract]          
Effective tax rates (as a percent)   32.20% 0.40% 39.00% 9.80%
Deferred tax benefit on impairment charge         $ 125.5
Income tax benefits for reorganization adjustments $ 102.9        
Fresh start adjustments, income tax expense 185.4        
Income tax expense (benefit), deferred tax liabilities 529.1        
Income tax expense (benefit), deferred tax assets $ 343.7        
COVID-19, employment tax, employer, deferral, CARES Act   $ 20.3     20.3
COVID-19, employee retention credit, CARES Act   $ 0.7     $ 0.7