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Segment Reporting - Additional Information (Details)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2019
Site
Dec. 31, 2020
USD ($)
Segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting Information [Line Items]        
Number of reportable segments | Segment   2    
Contract costs, unamortized balance   $ 8.3 $ 6.5  
Contract costs, amortization against operating revenues   1.2 $ 1.0 $ 0.9
Number of converted operated sites to dealer operated sites | Site 46      
Wholesale [Member]        
Segment Reporting Information [Line Items]        
Loss on sale of inventory   0.5    
Goodwill reassignment   $ 4.5