Income Taxes - Income Tax Provision Reconciliation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 29, 2015	Mar. 30, 2014
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Federal statutory income tax rate	35.00%	35.00%
Income tax benefit at federal statutory rate	$ (4.9)	$ (4.4)
State and foreign taxes, net of federal tax benefit and valuation allowance	0.5	0.6
Nondeductible expenses and other	0.5	0.6
Impact of deferred tax liabilities for indefinite-lived assets	1.8	1.7
Increase in reserves for uncertain tax positions	0.1	0
Increase in federal valuation allowance	4.4	3.8
Total income tax provision	$ 2.4	$ 2.3