Income Taxes (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 24, 2013	Sep. 30, 2014
Reconciliation unrecognized tax benefits
Income tax expense	$ 4.6	$ 4.4
Income Tax Expense (Benefit)	4.8
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	0.8
Deferred State and Local Income Tax Expense (Benefit)	1.0
Liability for Uncertain Tax Positions, Noncurrent		1.6
Uncertain tax positions	$ 4.0		$ 2.8