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Cash Flow Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Supplemental Cash Flow Information [Abstract]    
Non-cash investing and financing activities primarily related to capital leases $ 5.3us-gaap_CapitalLeaseObligationsIncurred  
Accrued purchases of property and equipment 12.8us-gaap_CapitalExpendituresIncurredButNotYetPaid 13.2us-gaap_CapitalExpendituresIncurredButNotYetPaid
Interest payments including interest on vehicle inventory financing 31.5us-gaap_InterestPaid 32.2us-gaap_InterestPaid
Income tax payments, net of income tax refunds $ 18.4us-gaap_IncomeTaxesPaidNet $ 8.9us-gaap_IncomeTaxesPaidNet