Stock Repurchase Programs (Details) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011	Oct. 01, 2010
Stock Repurchase Programs [Line Items]
Cumulative Repurchase of common stock - shares	0	0
Repurchase of outstanding common stock		$ 5,000,000	$ 132,600,000
Number of stock repurchase programs authorized by the Board of Directors		2
Other Stock Repurchases [Member]
Stock Repurchase Programs [Line Items]
Repurchase of common stock - shares	19,164	900,000
Repurchase of outstanding common stock	100,000	4,400,000
Rule 10b5-1 Program [Member]
Stock Repurchase Programs [Line Items]
Repurchase of common stock - shares	10,057	100,000
Repurchase of outstanding common stock	42,980	600,000
$600 Million Repurchase Program [Member]
Stock Repurchase Programs [Line Items]
Authorization to repurchase outstanding common stock		600,000,000
Cumulative Repurchase of common stock - shares		56,600,000
Cumulative Repurchase of outstanding common stock		375,400,000
Stock available to be purchased under stock repurchase program		$ 224,600,000