Income Taxes - Income Tax Provision Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income tax expense at federal statutory rate	$ 0.5	$ 0.5
State and foreign taxes, net of federal tax benefit and valuation allowance	0.2	0.2
Release of valuation allowance due to FTT acquisition	(3.4)	0.0
GILTI	0.0	0.1
Nondeductible expenses and other	0.1	0.2
Impact of deferred tax liabilities for indefinite-lived assets	0.1	0.4
Increase in reserves for uncertain tax positions	1.6	0.2
Decrease in federal valuation allowance	(0.6)	(0.7)
Total income tax benefit (provision)	$ (1.5)	$ 0.9