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
Mar. 31, 2012
Apr. 02, 2011
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
Income tax provision $ 10.5 $ 13.2  
Income tax expense related to the adjustment of valuations allowances 1.4    
Amount of tax provision related to reassessment of tax reserves   0.3  
Effective tax rate 20.90% 32.40%  
Gross unrecognized tax benefits, including interest 26.1   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 4.1    
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   2.5
Amounts accrued for penalties for unrecognized tax benefits $ 0   $ 0