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Cash Flow Information (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Supplemental Cash Flow Information [Abstract]    
Non-cash investing and financing activities primarily related to capital leases $ 18.1 $ 11.6
Accrued purchases of property and equipment 16.5 15.7
Interest payments including interest on vehicle inventory financing 101.0 99.7
Income tax payments, net of income tax refunds $ 218.1 $ 180.4