Net Income per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jul. 02, 2011		Jun. 30, 2012		Jul. 02, 2011
Earnings Per Share, Diluted [Line Items]
Net income attributable to shareholders	$ 114,383		$ 156,197		$ 228,011		$ 292,506
Weighted average shares outstanding - basic	110,433		115,434		111,218		115,323
Net effect of various dilutive stock-based compensation awards	1,598		2,035		1,861		2,140
Weighted average shares outstanding - diluted	112,031		117,469		113,079		117,463
Net income per share:
Basic	$ 1.04		$ 1.35		$ 2.05		$ 2.54
Diluted	$ 1.02	[1]	$ 1.33	[1]	$ 2.02	[1]	$ 2.49	[1]
Stock Compensation Plan [Member]
Net income per share:
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,552		398		804		342

[1] (a)Stock-based compensation awards for the issuance of 1,552 and 804 shares for the second quarter and first six months of 2012 and 398 and 342 shares for the second quarter and first six months of 2011, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.