Quarterly report pursuant to Section 13 or 15(d)

Share Repurchases (Details)

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Share Repurchases (Details) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2011
Aug. 31, 2010
Sep. 30, 2012
Oct. 02, 2011
Sep. 30, 2012
Oct. 02, 2011
Share Repurchases            
Amount authorized for repurchase of equity securities $ 50.0 $ 50.0        
Shares repurchased     266,314 681,466 521,445 1,100,000
Average purchase price (in dollars per share)     $ 29.83 $ 29.77 $ 30.02 $ 27.78
Aggregate price of shares repurchased     7.9 20.3 15.7 30.7
Amount remaining for repurchases of common stock under board authorized plan         $ 32.0