Changes in Equity and Noncontrolling Interests (Details) (USD $) In Thousands, except Share data in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			$ 2,342,715	$ 1,762,818
Net income	136,058	138,799	413,837	369,946
Noncontrolling interest acquired				10,286
Translation adjustments	(49,279)	49,779	(7,083)	11,186
Revaluation of interest rate derivatives		236		2,309
Defined benefit plan liability adjustment, net of tax		26	222	1,085
Payments to shareholders of non-controlling interests			(3,835)	(2,421)
Purchase of noncontrolling interests			(24,854)	(20,167)
Purchase of treasury stock			(534,000)
Stock options exercised, including tax benefit			29,186	24,357
Dividends declared	(2,494)	(2,611)	(7,650)	(7,816)
Stock-based compensation expense			21,011	18,580
Balance at end of period	2,229,549	2,170,163	2,229,549	2,170,163
Common Stock
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period (in shares)			176	173
Balance at beginning of period			176	174
Retirement of treasury stock			(11)
Retirement of treasury stock (in shares)			(11)
Stock options exercised, including tax benefit				1
Stock options exercised, including tax benefit (in shares)				2
Balance at end of period (in shares)	165	175	165	175
Balance at end of period	165	175	165	175
Additional Paid-In Capital
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			144,855	71,368
Purchase of noncontrolling interests			(15,962)	(14,325)
Stock options exercised, including tax benefit			29,186	24,356
Stock-based compensation expense			21,011	18,580
Balance at end of period	179,090	99,979	179,090	99,979
Accumulated Earnings
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			2,260,581	1,774,625
Net income			410,332	365,292
Retirement of treasury stock			(533,989)
Dividends declared			(7,650)	(7,816)
Balance at end of period	2,129,274	2,132,101	2,129,274	2,132,101
Accum. Other Comprehensive Loss
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			(84,757)	(100,090)
Translation adjustments			(7,420)	10,400
Revaluation of interest rate derivatives				2,309
Defined benefit plan liability adjustment, net of tax			222	1,085
Balance at end of period	(91,955)	(86,296)	(91,955)	(86,296)
Treasury Stock
Increase (Decrease) In Shareholders' Equity
Purchase of treasury stock			(534,000)
Retirement of treasury stock			534,000
Noncontrolling Interests.
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			21,860	16,741
Net income			3,505	4,654
Noncontrolling interest acquired				10,286
Translation adjustments			337	786
Payments to shareholders of non-controlling interests			(3,835)	(2,421)
Purchase of noncontrolling interests			(8,892)	(5,842)
Balance at end of period	$ 12,975	$ 24,204	$ 12,975	$ 24,204