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Debt (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended
Feb. 29, 2020
Mar. 31, 2020
Mar. 31, 2019
Apr. 30, 2020
Debt Instrument [Line Items]        
Loss on extinguishment of debt   $ 36,987,000 $ 0  
Notes due        
Debt Instrument [Line Items]        
Repayments of debt   5,000,000    
Line of credit | Revolving credit facility        
Debt Instrument [Line Items]        
Maximum borrowing capacity   500,000,000    
Line of credit | Revolving credit facility | Subsequent Event        
Debt Instrument [Line Items]        
Remaining borrowing capacity       $ 100,000,000
2025 Term Loan | Notes due        
Debt Instrument [Line Items]        
Debt term 5 years      
Loan amount $ 850,000,000      
2025 Term Loan | Notes due | LIBOR        
Debt Instrument [Line Items]        
Basis spread on variable rate 5.50%      
Notes due October 2021 | Notes due        
Debt Instrument [Line Items]        
Debt redeemed   428,000,000    
Notes due May 2022 | Notes due        
Debt Instrument [Line Items]        
Debt redeemed   250,000,000    
Notes due April 2023 | Notes due        
Debt Instrument [Line Items]        
Debt redeemed   125,000,000    
Notes due March 2024 | Notes due        
Debt Instrument [Line Items]        
Debt redeemed   $ 125,000,000