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LONG-TERM DEBT - 6.375% Senior Secured Notes due 2026 (Details) - Secured Debt - USD ($)
May 01, 2019
Dec. 31, 2020
Nov. 22, 2019
Aug. 07, 2019
6.375% Senior Secured Notes        
Debt Instrument [Line Items]        
Debt instrument, face amount $ 800,000,000 $ 800,000,000.0    
Stated interest rate (as a percent) 6.375% 6.375% 6.375% 6.375%
Percentage of redeemed Price 100.00%      
Percentage of principal amount redeemed 40.00%      
Redemption price, percentage 106.375%      
3.75% Senior Secured Notes        
Debt Instrument [Line Items]        
Stated interest rate (as a percent) 6.375%