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Segment Reporting - Additional Information (Details)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2020
USD ($)
Site
Segment
Mar. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Site
Dec. 31, 2019
USD ($)
Segment Reporting [Abstract]        
Number of reportable segments | Segment 2      
Number of dealerize sites | Site 0   46  
Contract costs, unamortized balance $ 6.7   $ 6.7 $ 6.5
Contract costs, amortization against operating revenues $ 0.3 $ 0.2