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Long-Term Debt and Credit Facilities - Senior Credit Facilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Jul. 12, 2017
Senior secured term loan    
Long-Term Debt and Credit Facilities.    
Debt Instrument, Face Amount   $ 350.0
Original issue discount   7.0
Senior secured revolving facility    
Long-Term Debt and Credit Facilities.    
Maximum borrowing capacity   $ 100.0
Letters of credit outstanding $ 0.5  
Credit facility drawn $ 100.0