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Debt (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 29, 2020
Nov. 30, 2019
Dec. 31, 2020
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
May 31, 2020
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         21,000,000      
Line of credit | Revolving credit facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity       $ 500,000,000 500,000,000      
Remaining borrowing capacity               $ 100,000,000
Notes due October 2021 | Notes due                
Debt Instrument [Line Items]                
Increase in interest rate   0.50%            
Debt redeemed       $ 428,000,000 428,000,000      
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       $ 250,000,000 250,000,000      
Notes due April 2023 | Notes due                
Debt Instrument [Line Items]                
Increase in interest rate   0.50%            
Debt redeemed       125,000,000 125,000,000      
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  
Notes due March 2024 | Notes due                
Debt Instrument [Line Items]                
Debt redeemed       125,000,000 125,000,000      
Interest rate swaps                
Debt Instrument [Line Items]                
Fixed interest rate             0.4443%  
Derivative notional amount       $ 500,000,000 $ 500,000,000   $ 500,000,000