Changes in Equity and Noncontrolling Interests (Details) (USD $) In Thousands, except Share data in Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			$ 2,184,786	$ 2,342,715
Balance at beginning of period			(120,057)
Net income	141,893	148,894	269,141	277,779
Translation adjustments			(14,066)	42,196
Revaluation of forward contract derivatives			456
Defined benefit plan liability adjustment, net of tax				222
Payments to shareholders of noncontrolling interests			(1,650)	(2,268)
Purchase of noncontrolling interests				(24,854)
Purchase of treasury stock			(201,020)	(360,998)
Stock options exercised, including tax benefit			44,707	26,387
Dividends declared	(16,889)	(2,515)	(33,938)	(5,156)
Stock-based compensation expense			15,101	13,381
Balance at end of period	2,263,517	2,309,404	2,263,517	2,309,404
Balance at end of period	(133,607)		(133,607)
Common Stock
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period (in shares)			163	176
Balance at beginning of period			163	176
Retirement of treasury stock			(3)	(6)
Retirement of treasury stock (in shares)			(3)	(6)
Stock options exercised, including tax benefit			1
Stock options exercised, including tax benefit (in shares)			1
Balance at end of period (in shares)	161	170	161	170
Balance at end of period	161	170	161	170
Additional Paid-in Capital
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			189,166	144,855
Purchase of noncontrolling interests				(15,962)
Stock options exercised, including tax benefit			44,706	26,387
Stock-based compensation expense			15,101	13,381
Balance at end of period	248,973	168,661	248,973	168,661
Accumulated Earnings
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			2,102,497	2,260,581
Net income			267,505	275,709
Retirement of treasury stock			(201,017)	(360,992)
Dividends declared			(33,938)	(5,156)
Balance at end of period	2,135,047	2,170,142	2,135,047	2,170,142
Accum. Other Comprehensive Loss
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			(120,057)	(84,757)
Translation adjustments			(14,006)	42,014
Revaluation of forward contract derivatives			456
Defined benefit plan liability adjustment, net of tax				222
Balance at end of period	(133,607)	(42,521)	(133,607)	(42,521)
Treasury Stock
Increase (Decrease) In Shareholders' Equity
Purchase of treasury stock			(201,020)	(360,998)
Retirement of treasury stock			201,020	360,998
Noncontrolling Interests
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			13,017	21,860
Net income			1,636	2,070
Translation adjustments			(60)	182
Payments to shareholders of noncontrolling interests			(1,650)	(2,268)
Purchase of noncontrolling interests				(8,892)
Balance at end of period	$ 12,943	$ 12,952	$ 12,943	$ 12,952