Restructuring Expenses - Additional Information (Details) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Nov. 30, 2018 Employees	Sep. 29, 2019 USD ($) Rate	Sep. 30, 2018 USD ($)	Sep. 29, 2019 USD ($) Employees employee Rate	Sep. 30, 2018 USD ($)
Motorcycles and Related Products | Temporary Inefficiencies | Cost of Sales
Restructuring Cost and Reserve
Incremental cost of goods sold		$ 2.5	$ 6.2	$ 10.0	$ 9.3
Manufacturing Optimization Plan | Motorcycles and Related Products
Restructuring Cost and Reserve
Restructuring and consolidation costs		$ 144.5		$ 144.5
Cash charges | Rate		70.00%		70.00%
Manufacturing Optimization Plan | Motorcycles and Related Products | Minimum
Restructuring Cost and Reserve
Restructuring expenses and other related costs		$ 142.0		$ 142.0
Manufacturing Optimization Plan | Motorcycles and Related Products | Minimum | Restructuring Expense
Restructuring Cost and Reserve
Restructuring expenses and other related costs		119.0		119.0
Manufacturing Optimization Plan | Motorcycles and Related Products | Minimum | Temporary Inefficiencies
Restructuring Cost and Reserve
Restructuring expenses and other related costs		23.0		23.0
Manufacturing Optimization Plan | Motorcycles and Related Products | Minimum | Employee Termination Benefits
Restructuring Cost and Reserve
Restructuring expenses and other related costs		38.0		38.0
Manufacturing Optimization Plan | Motorcycles and Related Products | Minimum | Accelerated Depreciation
Restructuring Cost and Reserve
Restructuring expenses and other related costs		48.0		48.0
Manufacturing Optimization Plan | Motorcycles and Related Products | Minimum | Other
Restructuring Cost and Reserve
Restructuring expenses and other related costs		33.0		33.0
Manufacturing Optimization Plan | Motorcycles and Related Products | Maximum
Restructuring Cost and Reserve
Restructuring expenses and other related costs		152.0		152.0
Manufacturing Optimization Plan | Motorcycles and Related Products | Maximum | Restructuring Expense
Restructuring Cost and Reserve
Restructuring expenses and other related costs		124.0		124.0
Manufacturing Optimization Plan | Motorcycles and Related Products | Maximum | Temporary Inefficiencies
Restructuring Cost and Reserve
Restructuring expenses and other related costs		28.0		28.0
Manufacturing Optimization Plan | Motorcycles and Related Products | Maximum | Employee Termination Benefits
Restructuring Cost and Reserve
Restructuring expenses and other related costs		40.0		40.0
Manufacturing Optimization Plan | Motorcycles and Related Products | Maximum | Accelerated Depreciation
Restructuring Cost and Reserve
Restructuring expenses and other related costs		49.0		49.0
Manufacturing Optimization Plan | Motorcycles and Related Products | Maximum | Other
Restructuring Cost and Reserve
Restructuring expenses and other related costs		$ 35.0		$ 35.0
Employee Termination Benefits | Motorcycles and Related Products
Restructuring Cost and Reserve
Restructuring and consolidation costs, positions eliminated | Employees	70
Kansas City, Missouri | Manufacturing Optimization Plan
Restructuring Cost and Reserve
Number of jobs eliminated | employee				800
York, Pennsylvania | Manufacturing Optimization Plan
Restructuring Cost and Reserve
Number of jobs added | employee				450
Adelaide, Australia | Manufacturing Optimization Plan
Restructuring Cost and Reserve
Number of jobs eliminated | Employees				90