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Cash Flow Information (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]        
Cash and cash equivalents $ 51.1   $ 48.6  
Restricted cash included in Current Assets 0.8   0.8  
Total cash, cash equivalents, and restricted cash 51.9 $ 53.8 $ 49.4 $ 71.1
Accrued purchases of property and equipment 26.2 28.3    
Interest payments, net of amounts capitalized and including interest on vehicle inventory financing 130.6 123.6    
Income tax payments, net of income tax refunds $ 76.0 $ 170.8