Income Taxes - Income Tax Provision Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 01, 2018	Mar. 26, 2017
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income tax expense (benefit) at federal statutory rate	$ 0.5	$ (3.1)
State and foreign taxes, net of federal tax benefit and valuation allowance	0.2	0.2
Global intangible low-taxed income (GILTI)	0.1	0.0
Nondeductible expenses and other	0.2	0.4
Impact of deferred tax liabilities for indefinite-lived assets	0.4	1.2
Increase in reserves for uncertain tax positions	0.2	0.1
Increase (decrease) in federal valuation allowance	(0.7)	2.6
Total income tax provision	$ 0.9	$ 1.4