Restructuring Expenses - Additional Information (Details) $ in Millions	1 Months Ended	12 Months Ended
	Nov. 30, 2018 Employees	Dec. 31, 2019 USD ($) Employees Rate	Dec. 31, 2018 USD ($)
2018 Kansas City Restructuring Plan
Restructuring Cost and Reserve
Number of jobs eliminated		800
Number of jobs added		450
2018 Adelaide Restructuring Plan
Restructuring Cost and Reserve
Number of jobs eliminated		90
Motorcycles and Related Products | Manufacturing Optimization Plan
Restructuring Cost and Reserve
Restructuring and consolidation costs | $		$ 145.4
Restructuring costs | $		$ 43.0
Motorcycles
Restructuring Cost and Reserve
Restructuring expenses and other related costs | Rate		60.00%
Motorcycles | 2018 Reorganization Plan
Restructuring Cost and Reserve
Restructuring and consolidation costs, positions eliminated	70
Motorcycles | Temporary Inefficiencies | Cost of goods sold
Restructuring Cost and Reserve
Incremental cost of goods sold | $		$ 10.3	$ 12.9