Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 29, 2012
Oct. 01, 2011
Sep. 29, 2012
Oct. 01, 2011
Dec. 31, 2011
Income Tax Disclosure [Abstract]          
Income tax provision $ 10.5 $ 0 $ 31.0 $ 30.8  
Amount of tax provision related to reassessment of tax reserves 2.2 0.5   1.6  
Reassessment of tax reserves and release and adjustments of valuation allowances     0.5    
Effective tax rate 84.00% 0.00% 19.80% 23.30%  
Gross unrecognized tax benefits, including interest 27.9   27.9   26.9
Possible decrease of total amount of gross unrecognized tax benefits due to settlements with taxing authorities or lapses in the statute of limitations 18.8   18.8    
Number of months from reporting date for possible decrease of total amount of gross unrecognized tax benefits (in months)     P12M    
Interest accrued related to unrecognized tax benefits 3.1   3.1   2.5
Amounts accrued for penalties for unrecognized tax benefits $ 0   $ 0   $ 0