Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Repossessed Assets	$ 17.7	$ 13.4
Marketable Securities, Unrealized Loss	(0.6)	(0.7)
Gross unrealized gain, net of tax	$ (0.4)	(0.4)
Marketable securities maturity period, minimum (in months)	4 months
Marketable securities maturity period, maximum (in months)	16 months
Allowance for doubtful accounts receivable	$ 2.9	3.5
Other inventories	266.6	232.8
Deferred revenue related to extended service contracts	4.6	5.7
Research and development expenses	161.2	138.3	$ 152.2
Advertising costs	119.8	107.4	90.7
Total share-based award compensation expense	29.4	37.9	41.2
Total share-based award compensation expense, net of taxes	18.5	23.9	26.0
Safety Recall [Member]
Property, Plant and Equipment [Line Items]
Loss Contingency Accrual, Product Liability, Gross	$ 10.2	$ 9.8	$ 4.0
Motorcycles Segment [Member]
Property, Plant and Equipment [Line Items]
Standard Product Warranty, Period	2 years
Parts and Accessories Finished Goods [Member]
Property, Plant and Equipment [Line Items]
Standard Product Warranty, Period	1 year
Japan [Member] | Motorcycles Segment [Member]
Property, Plant and Equipment [Line Items]
Standard Product Warranty, Period	3 years
Buildings [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property, plant and equipment, minimum (in years)	30 years
Building Equipment and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property, plant and equipment, minimum (in years)	7 years
Machinery and equipment | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property, plant and equipment, minimum (in years)	3 years
Machinery and equipment | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property, plant and equipment, minimum (in years)	10 years
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property, plant and equipment, minimum (in years)	5 years
Software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property, plant and equipment, minimum (in years)	3 years
Software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property, plant and equipment, minimum (in years)	7 years