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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 02, 2017
Jul. 03, 2016
Jul. 02, 2017
Jul. 03, 2016
Income Tax Disclosure [Abstract]        
Income tax expense $ 1.5 $ 0.8 $ 4.2 $ 3.5
Effective tax rate 7.60% 8.10% 12.20% 14.80%
Potential future valuation allowance release     $ 5.0