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Debt and Credit Arrangements - Interest Expense and Financing Cost Amortization (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Debt Instrument    
Interest expense excluding amortization $ 2.0 $ 7.2
Financing costs amortization 1.2 1.0
Revolving Credit Facility    
Debt Instrument    
Interest expense excluding amortization 1.3 4.8
Financing costs amortization 1.0 0.8
Revolving Credit Facility | Term loan    
Debt Instrument    
Interest expense excluding amortization 0.6 4.2
Revolving Credit Facility | Senior secured revolving credit facility    
Debt Instrument    
Interest expense excluding amortization $ 0.7 $ 0.6