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Long-Term Debt (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Apr. 15, 2019
Dec. 31, 2018
Dec. 31, 2017
Oct. 31, 2017
Debt Instrument [Line Items]                
Term loan $ 725,000,000 $ 725,000,000   $ 772,000,000        
Letters of credit outstanding 0 0            
Repayments of lines of credit   47,000,000 $ 0          
Revolving Credit Facility                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity 200,000,000 200,000,000            
Revolving credit facility $ 0 0            
Line of credit facility, maximum amount outstanding during period   $ 200,000,000            
Senior Secured First Lien Credit Facility                
Debt Instrument [Line Items]                
Debt instrument, face amount           $ 1,000,000,000.0   $ 900,000,000
Senior Secured First Lien Credit Facility | Term Loan                
Debt Instrument [Line Items]                
Debt instrument, face amount               800,000,000
Senior Secured First Lien Credit Facility | Revolving Credit Facility                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity           $ 200,000,000 $ 100,000,000 $ 100,000,000
Credit Facility                
Debt Instrument [Line Items]                
Debt, weighted average interest rate 3.75% 3.75%            
Credit Facility | Term Loan                
Debt Instrument [Line Items]                
Term loan $ 725,000,000 $ 725,000,000            
Credit Facility | Revolving Credit Facility | Term Loan                
Debt Instrument [Line Items]                
Repayments of lines of credit $ 47,000,000              
Senior Unsecured Notes Due 2026                
Debt Instrument [Line Items]                
Debt instrument, face amount         $ 375,000,000      
Debt instrument interest stated percentage         7.625%      
Debt, weighted average interest rate 5.07% 5.07%