Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary Of Significant Accounting Policies [Line Items]
Marketable Securities, Unrealized Gain (Loss)	$ 600,000	$ 700,000
Gross unrealized gain, net of tax	400,000	500,000
Marketable securities maturity period, minimum (in months)	12
Marketable securities maturity period, maximum (in months)	36
Allowance for doubtful accounts receivable	5,000,000	5,000,000
Repossessed inventory	11,900,000	14,500,000
Other inventories	195,000,000	215,200,000
Liability for safety recall campaigns	4,600,000	10,700,000	3,200,000
Deferred revenue related to extended service contracts	8,300,000	12,200,000
Research and development expenses	137,300,000	145,400,000	136,200,000
Advertising costs	80,700,000	82,300,000	75,800,000
Total share-based award compensation expense	40,815,000	38,192,000	30,431,000
Total share-based award compensation expense, net of taxes	$ 25,700,000	$ 24,000,000	$ 19,200,000
Buildings [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of property, plant and equipment, minimum (in years)	30 years 0 months 0 days
Building Equipment And Land Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of property, plant and equipment, minimum (in years)	7 years 0 months 0 days
Machinery And Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of property, plant and equipment, minimum (in years)	3 years 0 months 0 days
useful lives of property, plant and equipment, maximum (in years)	10 years 0 months 0 days
Software [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of property, plant and equipment, minimum (in years)	3 years 0 months 0 days
useful lives of property, plant and equipment, maximum (in years)	7 years 0 months 0 days
Furniture and Fixtures [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of property, plant and equipment, minimum (in years)	5 years 0 months 0 days