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 6 Months Ended
Jul. 02, 2011
Jul. 03, 2010
Jul. 02, 2011
Jul. 03, 2010
Dec. 31, 2010
Income Taxes (Details) [Abstract]          
Income tax provision $ 17.6 $ 15.2 $ 30.8 $ 15.5  
Amount of tax provision related to reassessment of tax reserves (1.8) 1.3 (2.1) (0.8)  
Effective tax rate (in hundredths) 20.30% 52.60% 24.10% 95.70%  
Gross unrecognized tax benefits, including interest 31.5   31.5   36.9
Possible decrease of total amount of gross unrecognized tax benefits due to settlements with taxing authorities or lapses in the statute of limitations 10.6   10.6    
Number of months from reporting date for possible decrease of total amount of gross unrecognized tax benefits     12    
Interest related to unrecognized tax benefits 3.9   3.9   4.9
Penalties related to unrecognized tax benefits $ 0   $ 0   $ 0