Consolidated Statements Of Shareholders' Investment (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Beginning balance	$ 1,631,500	$ 2,205,900	$ 1,988,200
Net income	328,000	509,600	461,400
Change in derivative instruments designated as cash flow hedges (net of taxes)	(1,400)	900	(4,800)
Foreign currency translation adjustment	12,100	(38,400)	83,500
Benefit plan adjustments (net of taxes)	(21,100)	6,000	(9,000)
Total comprehensive income	317,600	478,100	531,100
Cash dividends declared	(65,600)	(65,900)	(65,800)
Issuance of common stock	110,200	43,300	29,700
Share-based compensation	55,400	58,100	52,300
Purchases of common stock	(295,100)	(1,069,900)	(342,200)
Tax benefit relating to share-based compensation plans	28,200	7,800	12,600
Purchase of noncontrolling interest		(25,900)
Ending balance	1,782,200	1,631,500	2,205,900
Common Stock [Member]
Beginning balance	21,300	24,000	24,800
Beginning balance (in shares)	84,973,586	95,917,095	99,393,020
Issuance of common stock	600	300	300
Issuance of common stock (in shares)	2,257,762	1,081,491	1,059,122
Purchases of common stock	(700)	(3,000)	(1,100)
Purchases of common stock (in shares)	(2,688,010)	(12,025,000)	(4,535,047)
Ending balance	21,200	21,300	24,000
Ending balance (in shares)	84,543,338	84,973,586	95,917,095
Capital In Excess Of Par Value [Member]
Beginning balance	1,146,400	1,060,900	966,600
Issuance of common stock	109,600	43,000	29,400
Share-based compensation	55,400	58,100	52,300
Purchases of common stock	10,200	(10,200)
Tax benefit relating to share-based compensation plans	28,200	7,800	12,600
Purchase of noncontrolling interest		(13,200)
Ending balance	1,349,800	1,146,400	1,060,900
Retained Earnings [Member]
Beginning balance	520,000	1,133,400	1,080,200
Net income	328,000	509,200	460,100
Cash dividends declared	(65,600)	(65,900)	(65,800)
Purchases of common stock	(304,600)	(1,056,700)	(341,100)
Ending balance	477,800	520,000	1,133,400
Accumulated Other Comp. (Loss) Inc. [Member]
Beginning balance	(56,200)	(24,700)	(94,400)
Change in derivative instruments designated as cash flow hedges (net of taxes)	(1,400)	900	(4,800)
Foreign currency translation adjustment	12,100	(38,400)	83,500
Benefit plan adjustments (net of taxes)	(21,100)	6,000	(9,000)
Ending balance	(66,600)	(56,200)	(24,700)
Noncontrolling Interest [Member]
Beginning balance		12,300	11,000
Net income		400	1,300
Change in derivative instruments designated as cash flow hedges (net of taxes)
Foreign currency translation adjustment
Benefit plan adjustments (net of taxes)
Total comprehensive income
Cash dividends declared
Issuance of common stock
Share-based compensation
Purchases of common stock
Tax benefit relating to share-based compensation plans
Purchase of noncontrolling interest		(12,700)
Ending balance			$ 12,300