Income Taxes (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jul. 01, 2014	Dec. 30, 2014
Reconciliation unrecognized tax benefits
Income tax expense	$ 0.5	$ 1.1
Income tax benefit		2.3
Deferred state income tax expense (benefit)		$ 1.2
Uncertain tax positions	$ 2.7		$ 2.8