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Credit Facility (Details) - Credit Facility
3 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Line of Credit Facility [Line Items]    
Credit Facility [1] $ 500,000,000  
Outstanding [2] 42,000,000  
Available $ 458,000,000  
Number of extension you can request 2  
Letters of Credit, Term 1 year  
Direct advances on the credit facility outstanding $ 0 $ 0
[1] This credit facility expires in June 2024
[2]
Includes outstanding letters of credit.