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Debt (Narrative) (Details) - USD ($)
3 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Debt Instrument [Line Items]        
Principal amount   $ 2,482,931,000   $ 2,610,246,000
Loss on debt refinancing   51,394,000 $ 36,987,000  
Notes due        
Debt Instrument [Line Items]        
Loss on debt refinancing   51,000,000    
Line of credit | Revolving credit facility        
Debt Instrument [Line Items]        
Maximum borrowing capacity   500,000,000    
Outstanding borrowings     $ 0  
Notes due March 2027 | Notes due        
Debt Instrument [Line Items]        
Principal amount   $ 400,000,000   0
Interest rate   6.875%    
Notes due March 2029 | Notes due        
Debt Instrument [Line Items]        
Principal amount   $ 350,000,000   0
Interest rate   7.25%    
Term loan due March 2028 | Notes due        
Debt Instrument [Line Items]        
Principal amount   $ 450,000,000   0
Interest rate   4.10%    
Debt term   7 years    
Notes due October 2021 | Notes due        
Debt Instrument [Line Items]        
Principal amount   $ 0   152,588,000
Interest rate   4.875%    
Debt redeemed   $ 153,000,000    
Notes due May 2022 | Notes due        
Debt Instrument [Line Items]        
Principal amount   $ 72,873,000   148,792,000
Interest rate   5.375%    
Debt redeemed   $ 356,000,000    
Notes due May 2022 | Notes due | Forecast        
Debt Instrument [Line Items]        
Increase in interest rate 0.25%      
Notes due April 2023 | Notes due        
Debt Instrument [Line Items]        
Principal amount   $ 96,667,000   271,000,000
Interest rate   5.95%    
Debt redeemed   $ 356,000,000    
Notes due April 2023 | Notes due | Forecast        
Debt Instrument [Line Items]        
Increase in interest rate 0.25%      
Notes due March 2024 | Notes due        
Debt Instrument [Line Items]        
Principal amount   $ 267,952,000   374,000,000
Interest rate   4.625%    
Debt redeemed   $ 356,000,000    
Term loan due March 2026 | Notes due        
Debt Instrument [Line Items]        
Principal amount   $ 380,000,000   380,000,000
Interest rate   1.90%    
Term loan due January 2025 | Notes due        
Debt Instrument [Line Items]        
Principal amount   $ 0   $ 818,125,000
Repayments of debt   $ 818,000,000