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Vehicle Financing (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Vehicle Financing      
Maturity period of floor plan arrangements outside the U.S. if not payable on demand 90 days    
Weighted average interest rate on floor plan borrowings (as a percent) 1.70%us-gaap_DebtWeightedAverageInterestRate 1.90%us-gaap_DebtWeightedAverageInterestRate 2.10%us-gaap_DebtWeightedAverageInterestRate