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Taxes Based on Income (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Jun. 29, 2013
Jun. 30, 2012
Taxes Based on Income        
Discrete tax benefits impacting the effective tax rate related to retroactive reinstatement of the federal research and development tax credit     $ 4.2  
Discrete tax benefits impacting the effective tax rate for revaluation of deferred tax balances due to a change in the municipal statutory tax rate     3.7  
Income from continuing operations before taxes 109.5 73.6 190.6 135.9
Provision for income taxes 38.7 24.5 53.0 42.2
Effective tax rate (as a percent) 35.30% 33.30% 27.80% 31.10%
Discrete tax expense 1.4      
Discrete tax benefits   2.7 8.9 6.4
Reasonably possible decrease in unrecognized tax benefits during next 12 months $ 13   $ 13