Consolidated Statements of Equity (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings [Member]	Total Parent Equity [Member]	Noncontrolling Interest in Subsidiaries [Member]
Beginning Balance at Dec. 31, 2008	$ 2,393,378	$ 159,443		$ (478,562)	$ 2,643,451	$ 2,324,332	$ 69,046
Beginning Balance, shares at Dec. 31, 2008		159,442,508
Net income	399,575				399,575	399,575
Foreign currency translation adjustment	77,963			77,963		77,963
Pension and postretirement benefit adjustment, net of income taxes of $61,702, $(11,083), and $(98,973) for the years 2009, 2010 and 2011 respectively	90,702			90,702		90,702
Comprehensive income	568,240					568,240
Cash dividends declared, $1.60, $1.64 and $1.80 per share for the years 2009, 2010 and 2011 respectively	(254,995)				(254,995)	(254,995)
Stock options exercised, including tax benefit of $684, $(3,251) and $(5,356) for the years 2009, 2010 and 2011, respectively	1,194	198	996			1,194
Stock options exercised, including tax benefit of $684, $(3,251) and $(5,356) for the years 2009, 2010 and 2011, respectively, shares		197,718
Share-based compensation	8,578		8,578			8,578
Purchase of stock	(26,019)	(723)	(9,574)		(15,722)	(26,019)
Purchase of stock, shares		(722,380)
Noncontrolling interest activities	2,161						2,161
Purchase of remaining noncontrolling interest in Balkamp, Inc.	(63,165)						(63,165)
Ending Balance at Dec. 31, 2009	2,629,372	158,918	0	(309,897)	2,772,309	2,621,330	8,042
Ending Balance, shares at Dec. 31, 2009		158,917,846
Net income	475,511				475,511	475,511
Foreign currency translation adjustment	33,742			33,742		33,742
Pension and postretirement benefit adjustment, net of income taxes of $61,702, $(11,083), and $(98,973) for the years 2009, 2010 and 2011 respectively	(22,197)			(22,197)		(22,197)
Comprehensive income	487,056					487,056
Cash dividends declared, $1.60, $1.64 and $1.80 per share for the years 2009, 2010 and 2011 respectively	(258,912)				(258,912)	(258,912)
Stock options exercised, including tax benefit of $684, $(3,251) and $(5,356) for the years 2009, 2010 and 2011, respectively	12,336	564	11,772			12,336
Stock options exercised, including tax benefit of $684, $(3,251) and $(5,356) for the years 2009, 2010 and 2011, respectively, shares		564,288
Share-based compensation	7,016		7,016			7,016
Purchase of stock	(75,007)	(1,846)	(18,788)		(54,373)	(75,007)
Purchase of stock, shares		(1,845,873)
Noncontrolling interest activities	853						853
Ending Balance at Dec. 31, 2010	2,802,714	157,636	0	(298,352)	2,934,535	2,793,819	8,895
Ending Balance, shares at Dec. 31, 2010		157,636,261
Net income	565,116				565,116	565,116
Foreign currency translation adjustment	(22,017)			(22,017)		(22,017)
Pension and postretirement benefit adjustment, net of income taxes of $61,702, $(11,083), and $(98,973) for the years 2009, 2010 and 2011 respectively	(161,669)			(161,669)		(161,669)
Comprehensive income	381,430					381,430
Cash dividends declared, $1.60, $1.64 and $1.80 per share for the years 2009, 2010 and 2011 respectively	(281,790)				(281,790)	(281,790)
Stock options exercised, including tax benefit of $684, $(3,251) and $(5,356) for the years 2009, 2010 and 2011, respectively	4,307	443	3,864			4,307
Stock options exercised, including tax benefit of $684, $(3,251) and $(5,356) for the years 2009, 2010 and 2011, respectively, shares	1,486,000	443,170
Share-based compensation	7,547		7,547			7,547
Purchase of stock	(122,078)	(2,428)	(11,411)		(108,239)	(122,078)
Purchase of stock, shares		(2,428,315)
Noncontrolling interest activities	689						689
Ending Balance at Dec. 31, 2011	$ 2,792,819	$ 155,651	$ 0	$ (482,038)	$ 3,109,622	$ 2,783,235	$ 9,584
Ending Balance, shares at Dec. 31, 2011		155,651,116