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LONG-TERM OBLIGATIONS - 5-5/8% Senior Notes (Details) - USD ($)
3 Months Ended 6 Months Ended
Apr. 05, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Jan. 31, 2017
Debt Instrument [Line Items]            
Loss on early extinguishment of debt   $ (25,600,000) $ 0 $ (27,700,000) $ 0  
Senior Notes | 5-5/8% Notes            
Debt Instrument [Line Items]            
Face amount of debt           $ 600,000,000.0
Repayments of Senior Debt $ 622,900,000          
Redemption Premium 16,900,000          
Debt Instrument, Increase, Accrued Interest 6,000,000.0          
Loss on early extinguishment of debt $ 22,500,000          
Interest rate (as a percent)           5.625%