Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Apr. 01, 2014	Mar. 26, 2013	Apr. 01, 2014
Reconciliation unrecognized tax benefits
Income tax expense	$ 1.3	$ 2.4
Effective tax rate (percent)	30.20%	15.20%
Favorable tax adjustment	1.2
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	0.1
Liability for Uncertain Tax Positions, Noncurrent		1.4
Uncertain tax positions	$ 4.0		$ 4.0