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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jul. 01, 2011
Jul. 02, 2010
Jul. 01, 2011
Jul. 02, 2010
Dec. 31, 2010
Income Taxes            
Effective income tax rate   10.00% 83.40% 12.80% 56.60%  
Income tax settlement including IRS, state tax, and interest charges $ 8.1          
Net tax benefit from 2008 and 2009 IRS audit   2.3        
Reversal of unrecognized tax benefits 10.4          
Income tax settlement, net       27.5    
Effective income tax rate is lower than statutory federal income tax rate of     35.00%      
Unrecognized tax benefits that would impact effective tax rate   25.9   25.9   28.1
Income tax interest and penalties included in unrecognized tax benefit liabilities   $ 2.6   $ 2.6   $ 2.6