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Cash Flow Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Supplemental Cash Flow Information [Abstract]      
Non-cash investing and financing activities primarily related to capital leases $ 0   $ 21,200,000
Accrued purchases of property and equipment   $ 14,700,000 15,200,000
Interest payments including interest on vehicle inventory financing   91,000,000 68,200,000
Income tax payments, net of income tax refunds   $ 132,000,000 $ 161,000,000