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Vehicle Financing (Details)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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) 1.30% 2.20% 2.10%