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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended9 Months Ended
Sep. 30, 2011
Jul. 01, 2011
Oct. 01, 2010
Jul. 02, 2010
Sep. 30, 2011
Oct. 01, 2010
Dec. 31, 2010
Income Taxes [Abstract]       
Effective income tax rate9.00% 14.00% 12.00%43.00% 
Net tax benefit from 2008 and 2009 IRS audit $ 2.3     
Income tax settlement, net benefit   27.5   
Effective income tax rate is lower than statutory federal income tax rate of35.00% 35.00%    
Unrecognized tax benefits that would impact effective tax rate28.1   28.1 28.1
Income tax interest and penalties included in unrecognized tax benefit liabilities$ 2.9   $ 2.9 $ 2.6