Vehicle Financing (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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)	2.20%	2.10%	1.80%