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LONG-TERM DEBT - 5.25% Senior Secured Notes due 2027 (Details) - Secured Debt - USD ($)
Nov. 22, 2019
Aug. 07, 2019
May 01, 2019
Dec. 31, 2020
5.25% Senior Secured Notes due 2027        
Debt Instrument [Line Items]        
Stated interest rate (as a percent) 5.25% 5.25% 5.25% 5.25%
Debt instrument, face amount   $ 750,000,000.0    
Percentage of redeemed Price   100.00%    
Percentage of principal amount redeemed   40.00%    
Redemption price, percentage   105.25%    
6.375% Senior Secured Notes        
Debt Instrument [Line Items]        
Stated interest rate (as a percent) 6.375% 6.375% 6.375% 6.375%
Debt instrument, face amount     $ 800,000,000 $ 800,000,000.0
Percentage of redeemed Price     100.00%  
Percentage of principal amount redeemed     40.00%  
Redemption price, percentage     106.375%  
4.75% Senior Secured Notes due 2028        
Debt Instrument [Line Items]        
Stated interest rate (as a percent) 4.75% 4.75% 4.75%  
Debt instrument, face amount $ 500,000,000.0      
Percentage of redeemed Price 100.00%      
Percentage of principal amount redeemed 40.00%      
Redemption price, percentage 104.75%