Changes in Equity and Noncontrolling Interests (Details) (USD $) In Thousands, except Share data in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Increase (Decrease) In Shareholders' Equity
Balance			$ 2,342,715	$ 1,762,818
Net income	148,894	131,009	277,779	231,147
Noncontrolling interest acquired				10,286
Translation adjustments	18,701	(35,715)	42,196	(38,593)
Revaluation of interest rate derivatives		1,061		2,073
Defined benefit plan liability adjustment, net of tax		92	222	1,059
Payments to shareholders of non-controlling interests			(2,268)	(2,421)
Purchase of noncontrolling interests			(24,854)
Purchase of treasury stock			(360,998)
Stock options exercised, including tax benefit			26,387	8,236
Stock-based compensation expense			13,381	11,615
Balance	2,309,404	1,981,016	2,309,404	1,981,016
Common Stock
Increase (Decrease) In Shareholders' Equity
Balance			176	174
Balance (in shares)			176	173
Retirement of treasury stock			(6)
Retirement of treasury stock (in shares)			(6)
Stock options exercised, including tax benefit (in shares)				1
Balance	170	174	170	174
Balance (in shares)	170	174	170	174
Additional Paid-in Capital
Increase (Decrease) In Shareholders' Equity
Balance			144,855	71,368
Purchase of noncontrolling interests			(15,962)
Stock options exercised, including tax benefit			26,387	8,236
Stock-based compensation expense			13,381	11,615
Balance	168,661	91,219	168,661	91,219
Accumulated Earnings
Increase (Decrease) In Shareholders' Equity
Balance			2,260,581	1,774,625
Net income			275,709	228,024
Retirement of treasury stock			(360,992)
Dividends declared			(5,156)	(5,204)
Balance	2,170,142	1,997,445	2,170,142	1,997,445
Accum. Other Comprehensive Loss
Increase (Decrease) In Shareholders' Equity
Balance			(84,757)	(100,090)
Translation adjustments			42,014	(38,719)
Revaluation of interest rate derivatives				2,073
Defined benefit plan liability adjustment, net of tax			222	1,059
Balance	(42,521)	(135,677)	(42,521)	(135,677)
Treasury Stock
Increase (Decrease) In Shareholders' Equity
Purchase of treasury stock			(360,998)
Retirement of treasury stock			360,998
Noncontrolling Interests.
Increase (Decrease) In Shareholders' Equity
Balance			21,860	16,741
Net income			2,070	3,123
Noncontrolling interest acquired				10,286
Translation adjustments			182	126
Payments to shareholders of non-controlling interests			(2,268)	(2,421)
Purchase of noncontrolling interests			(8,892)
Balance	$ 12,952	$ 27,855	$ 12,952	$ 27,855