Quarterly Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Quarterly Data (Unaudited) [Abstract]
Revenue	$ 2,004,486	$ 2,138,606	$ 1,994,970	$ 1,812,078	$ 1,737,436	$ 1,757,253	$ 1,664,447	$ 1,481,055	$ 7,950,140	$ 6,640,191	$ 5,344,331
Gross Profit	757,395	806,282	775,996	711,751	686,772	680,557	658,824	590,452	3,051,424	2,616,605	2,013,144
Earnings from continuing operations	208,938	223,438	239,198	174,791	184,906	216,331	167,226	122,288	846,365	690,751	373,423
Earnings from continuing operations basic (in dollars per share)	$ 1.13	$ 1.20	$ 1.28	$ 0.94	$ 0.99	$ 1.16	$ 0.90	$ 0.65	$ 4.55	$ 3.70	$ 2.01
Earnings from continuing operations diluted (in dollars per share)	$ 1.12	$ 1.19	$ 1.26	$ 0.92	$ 0.97	$ 1.15	$ 0.89	$ 0.65	$ 4.48	$ 3.65	$ 2.00
Net earnings	$ 278,289	$ 172,280	$ 249,769	$ 194,905	$ 198,348	$ 223,759	$ 169,870	$ 108,127	$ 895,243	$ 700,104	$ 356,438
Net earnings per share - basic (in dollars per share)	$ 1.51	$ 0.93	$ 1.34	$ 1.04	$ 1.06	$ 1.20	$ 0.91	$ 0.58	$ 4.82	$ 3.75	$ 1.91
Net earnings per share - diluted (in dollars per share)	$ 1.49	$ 0.91	$ 1.32	$ 1.03	$ 1.04	$ 1.19	$ 0.90	$ 0.58	$ 4.74	$ 3.70	$ 1.91