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Related Party Transactions - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Aug. 07, 2017
Jun. 30, 2017
New Credit Agreement          
Related Party Transaction [Line Items]          
Securities called by warrants (shares)         3,863,326
Line of Credit          
Related Party Transaction [Line Items]          
Long-term borrowings outstanding   $ 60.9      
Line of Credit | Initial Term Loan          
Related Party Transaction [Line Items]          
Long-term borrowings outstanding $ 44.0 60.9 $ 64.3 $ 44.0  
Affiliated Entity          
Related Party Transaction [Line Items]          
Revenue from related party   $ 6.8 $ 16.3    
Affiliated Entity | ECMC          
Related Party Transaction [Line Items]          
Beneficial ownership percentage (as a percent)   11.50% 11.70%    
Affiliated Entity | ECMC | New Credit Agreement          
Related Party Transaction [Line Items]          
Securities called by warrants (shares)   5,794,990      
Affiliated Entity | ECMC | Premiere Credit of North America          
Related Party Transaction [Line Items]          
Initial stock consideration (shares) 1,000,000 185,406 185,406