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Credit Facility (Details) - Credit Facility
9 Months Ended
Sep. 30, 2019
USD ($)
Jun. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Line of Credit Facility [Line Items]      
Credit Facility $ 500,000,000 [1] $ 400,000,000  
Outstanding [2] 2,000,000    
Available 498,000,000    
Direct advances on the credit facility outstanding $ 0   $ 0
Number of extension you can request 2    
[1] This credit facility expires in June 2024
[2]
Includes outstanding letters of credit.