Shareholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended			9 Months Ended				12 Months Ended
	Sep. 30, 2011		Sep. 30, 2010	Sep. 30, 2011		Sep. 30, 2010		Dec. 31, 2010
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity Attributable to Parent				$ 1,251,582		$ 1,146,206		$ 1,146,206
Net Income	104,909		62,904	219,774		158,415		217,586
Dividends				(137,673)				(164,514)
Issuance of shares under incentive stock plans				8,248				26,314
Stock-based compensation				11,793				15,223
Excess tax benefit on stock-based compensation				4,951				5,411
Repurchase of common shares				(7,909)				(6,028)
Amortization of pension and postretirement plans	2,261		1,210	6,449		5,849		6,385
Foreign currency translation adjustment	3,584		3,198	11,314		(64)		4,162
Joint venture cash flow hedges	(630)		(104)	(498)		922		837
Stockholders' Equity Attributable to Parent	1,368,031			1,368,031				1,251,582
Common Stock, Dividends, Per Share, Declared	$ 0.40		$ 0.33	$ 1.12		$ 1.00		$ 1.36
Stock Split, Conversion Ratio	1.5
Common Stock Including Additional Paid in Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity Attributable to Parent				602,882		561,962		561,962
Shares, Issued				121,023,140	[1]	119,312,961	[1]	119,312,961	[1]
Issuance of shares under incentive stock plans				8,248				26,314
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures				1,013,180	[1]			1,914,341	[1]
Stock-based compensation				11,793				15,223
Excess tax benefit on stock-based compensation				4,951				5,411
Repurchase of common shares				(7,909)				(6,028)
Stock Repurchased During Period, Shares				(208,694)	[1]			(204,162)	[1]
Stockholders' Equity Attributable to Parent	619,965			619,965				602,882
Shares, Issued	121,827,626	[1]		121,827,626	[1]			121,023,140	[1]
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity Attributable to Parent				717,058		663,986		663,986
Net Income				219,774				217,586
Dividends				(137,673)				(164,514)
Stockholders' Equity Attributable to Parent	799,159			799,159				717,058
Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity Attributable to Parent				(68,358)		(79,742)		(79,742)
Amortization of pension and postretirement plans				6,449				6,385
Foreign currency translation adjustment				11,314				4,162
Joint venture cash flow hedges				(498)				837
Stockholders' Equity Attributable to Parent	$ (51,093)			$ (51,093)				$ (68,358)

[1] The impact of the August 2011 three-for-two stock split is reflected for all periods presented. See Note 2 - Earnings Per Common Share for additional information.