Restructuring Expenses Restructuring Expenses (Narrative) (Details) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018 USD ($) Rate	Sep. 30, 2018 USD ($) Employees Rate
2018 Kansas City Restructuring Plan
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Number of Positions Eliminated \| Employees		800
Restructuring and Related Cost, Expected Number of Positions Added \| Employees		450
2018 Adelaide Restructuring Plan
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Number of Positions Eliminated \| Employees		90
Motorcycles and Related Products
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost, Percentage Paid In Cash \| Rate	70.00%	70.00%
Decrease in Expected Restructuring and Related Costs		$ 15.0
Motorcycles and Related Products \| Temporary Inefficiencies \| Cost of Sales
Restructuring Cost and Reserve
Cost of Goods Sold	$ 6.2	9.3
Minimum \| Motorcycles and Related Products
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	155.0	155.0
Minimum \| Motorcycles and Related Products \| Restructuring Expense
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	125.0	125.0
Minimum \| Motorcycles and Related Products \| Temporary Inefficiencies
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	30.0	30.0
Minimum \| Motorcycles and Related Products \| Employee Severance
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	40.0	40.0
Minimum \| Motorcycles and Related Products \| Accelerated Depreciation
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	50.0	50.0
Minimum \| Motorcycles and Related Products \| Project Implementation Costs
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	35.0	35.0
Maximum \| Motorcycles and Related Products
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	185.0	185.0
Maximum \| Motorcycles and Related Products \| Restructuring Expense
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	145.0	145.0
Maximum \| Motorcycles and Related Products \| Temporary Inefficiencies
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	40.0	40.0
Maximum \| Motorcycles and Related Products \| Employee Severance
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	45.0	45.0
Maximum \| Motorcycles and Related Products \| Accelerated Depreciation
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	55.0	55.0
Maximum \| Motorcycles and Related Products \| Project Implementation Costs
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	$ 45.0	$ 45.0

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Restructuring and Related Cost, Expected Cost, Percentage Paid In Cash

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Amount expected to be recognized in earnings for the specified restructuring cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

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The expected number of positions to be eliminated as a result of restructuring activities.

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