Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Marketable Securities, Unrealized Loss	$ (1.5)	$ 0.6
Gross unrealized gain, net of tax	(1.0)	0.4
Marketable securities maturity period, minimum (in months)	1 month
Marketable securities maturity period, maximum (in months)	29 months
Allowance for doubtful accounts receivable	5.0	5.0
Repossessed inventory	13.8	11.9
Other inventories	210.7	195.0
Deferred revenue related to extended service contracts	6.8	8.3
Research and development expenses	152.2	137.3	145.4
Advertising costs	90.7	80.7	82.3
Total share-based award compensation expense	41.2	40.8	38.2
Total share-based award compensation expense, net of taxes	26.0	25.7	24.0
Safety Recall [Member]
Property, Plant and Equipment [Line Items]
Loss Contingency Accrual, Product Liability, Gross	$ 4.0	$ 4.6	$ 10.7
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 0 months 0 days
Building Equipment and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property, plant and equipment, minimum (in years)	7 years 0 months 0 days
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property, plant and equipment, minimum (in years)	3 years 0 months 0 days
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property, plant and equipment, minimum (in years)	10 years 0 months 0 days
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property, plant and equipment, minimum (in years)	5 years 0 months 0 days
Software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property, plant and equipment, minimum (in years)	3 years 0 months 0 days
Software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property, plant and equipment, minimum (in years)	7 years 0 months 0 days