Revenue - Performance Obligations (Details)	12 Months Ended
	Dec. 31, 2019
Motorcycles | Licensing
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Sale payment terms	30 days
Revenue recognized over remaining contract term	5 years
Financial Services | Other income
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue recognized over remaining contract term	6 years
Minimum | Motorcycles | Motorcycles
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Sale payment terms	30 days
Maximum | Motorcycles | Motorcycles
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Sale payment terms	120 days