Acquisitions (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Summary of pro-forma consolidated financial information
Net sales	$ 2,484,920,000	$ 2,252,866,000	$ 6,727,098,000	$ 6,208,024,000
Net income	179,877,000	171,047,000	426,710,000	390,541,000
Net income per common share:
Basic	$ 1.74	$ 1.59	$ 4.06	$ 3.60
Diluted	$ 1.71	$ 1.56	$ 3.97	$ 3.54
Acquisitions (Textual) [Abstract]
Aggregate consideration paid for 2010 acquisitions, net of cash acquired					$ 298,200,000