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Debt (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2020
May 31, 2020
Mar. 31, 2020
Feb. 29, 2020
Nov. 30, 2019
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Debt Instrument [Line Items]                        
Loss on extinguishment of debt     $ 37,000,000       $ 0   $ 667,000 $ 36,987,000 $ 667,000  
Interest rate swaps                        
Debt Instrument [Line Items]                        
Derivative notional amount $ 500,000,000           $ 500,000,000     $ 500,000,000    
Fixed interest rate 0.4443%           0.4443%     0.4443%    
Notes due                        
Debt Instrument [Line Items]                        
Repayments of debt                   $ 36,000,000    
Line of credit | Revolving credit facility                        
Debt Instrument [Line Items]                        
Repayments of debt $ 100,000,000                      
Maximum borrowing capacity 500,000,000           $ 500,000,000     500,000,000    
Long-term Line of Credit 0           0     0   $ 0
Notes due October 2021 | Notes due                        
Debt Instrument [Line Items]                        
Increase in interest rate   0.50%     0.50%              
Debt redeemed     428,000,000                  
Notes due October 2021 | Notes due | Forecast                        
Debt Instrument [Line Items]                        
Increase in interest rate           0.25%            
Notes due May 2022 | Notes due                        
Debt Instrument [Line Items]                        
Increase in interest rate               0.75%        
Debt redeemed     250,000,000                  
Notes due April 2023 | Notes due                        
Debt Instrument [Line Items]                        
Increase in interest rate   0.50%     0.50%              
Debt redeemed     125,000,000                  
Notes due April 2023 | Notes due | Forecast                        
Debt Instrument [Line Items]                        
Increase in interest rate           0.25%            
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%                
2025 Term Loan | Variable-Rate Term Loan                        
Debt Instrument [Line Items]                        
Loan amount $ 500,000,000           $ 500,000,000     $ 500,000,000    
Notes due March 2024 | Notes due                        
Debt Instrument [Line Items]                        
Debt redeemed     $ 125,000,000