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Debt - Availability and Outstanding Borrowings under Credit Agreement (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 19, 2018
Line of Credit Facility [Line Items]    
Total available balance $ 193.7  
Line of Credit    
Line of Credit Facility [Line Items]    
Line of credit available 200.0 $ 200.0
Outstanding borrowings 0.0  
Line of Credit | Letter of Credit    
Line of Credit Facility [Line Items]    
Line of credit available 10.0  
Outstanding letters of credit $ 6.3