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Cash Flow Information (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Supplemental Cash Flow Information [Abstract]        
Cash and cash equivalents $ 53.1   $ 69.2  
Restricted cash included in Current Assets 0.7   1.9  
Total cash, cash equivalents, and restricted cash 53.8 $ 55.6 $ 71.1 $ 65.4
Non-cash investing and financing activities related to property acquired under capital leases   2.2    
Capital lease and deferred purchase price related to acquisitions   3.3    
Accrued purchases of property and equipment 28.3 25.9    
Interest payments, net of amounts capitalized and including interest on vehicle inventory financing 123.6 99.2    
Income tax payments, net of income tax refunds $ 170.8 $ 124.1