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Long-term Debt - Revolving Line of Credit (Details) - Revolving Credit Facility - USD ($)
9 Months Ended
Sep. 30, 2019
Mar. 29, 2019
Jul. 31, 2017
Line of Credit Facility [Line Items]      
Line of credit facility, maximum borrowing capacity   $ 750,000,000 $ 500,000,000
Line of credit facility, additional maximum borrowing capacity     $ 250,000,000
Commitment fee percentage 0.10%    
London Interbank Offered Rate (LIBOR)      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 0.75%    
Federal Funds Rate      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 0.50%    
One-Month LIBOR Rate      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 1.00%    
One-Month LIBOR Rate | Minimum      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 0.00%