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Credit Facility (Details)
$ in Millions
6 Months Ended
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Line of Credit Facility [Line Items]    
Amount outstanding at period end $ 0.0 $ 30.0
Credit Facility    
Line of Credit Facility [Line Items]    
Borrowing limit [1] 500.0  
Amount outstanding at period end [2] $ 10.0  
Number of extension you can request 2  
Available $ 490.0  
Direct advances on the credit facility outstanding $ 0.0 $ 0.0
[1] This credit facility expires in June 2024.
[2] Includes outstanding commercial paper and letters of credit.