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Cash Flow Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]      
Business Acquisitions Capital Lease and Deferred Purchase Price $ 47.2    
Non-cash investing and financing activities primarily related to capital leases   $ 27.3 $ 11.6
Accrued purchases of property and equipment 29.1 25.3 16.3
Interest payments, net of amounts capitalized and including interest on vehicle inventory financing 183.9 135.3 136.4
Income tax payments, net of income tax refunds $ 265.5 $ 278.8 $ 225.0