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Cash Flow Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Supplemental Cash Flow Information [Abstract]      
Non-cash investing and financing activities primarily related to capital leases $ 27.3 $ 11.6 $ 18.0
Accrued purchases of property and equipment 25.3 16.3 28.1
Interest payments including interest on vehicle inventory financing 135.3 136.4 136.0
Income tax payments, net of income tax refunds $ 278.8 $ 225.0 $ 200.3