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Fair Value Information (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Assets        
Cash and cash equivalents $ 100.1 $ 111.5 $ 187.7 $ 205.3
Level 1 | Carrying Amount        
Assets        
Cash and cash equivalents 100.1 111.5    
Level 1 | Estimated Fair Value        
Assets        
Cash and cash equivalents 100.1 111.5    
Level 2 | Carrying Amount        
Liabilities        
Revolving credit facility 175.0 180.0    
Level 2 | Estimated Fair Value        
Liabilities        
Revolving credit facility $ 175.0 $ 180.0