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Debt (Narrative) (Details) - Unsecured term loan - USD ($)
Feb. 28, 2020
Mar. 31, 2020
Feb. 27, 2020
Dec. 31, 2019
Debt Instrument        
Long-term debt, gross $ 800,000,000 $ 800,000,000 $ 750,000,000 $ 750,000,000
Long-term debt, interest accrued at fixed rate $ 750,000,000      
Debt instrument, interest rate, stated percentage (percent) 3.87% 1.94%    
Long-term debt, interest accrued at floating rate $ 50,000,000      
Debt Instrument, Interest Rate, Effective Percentage   3.75%    
LIBOR        
Debt Instrument        
Spread Over LIBOR (percent) 1.00%