Income Taxes - Income Tax Provision Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income tax expense (benefit) at federal statutory rate	$ 0.8	$ (0.8)	$ 1.3	$ (0.3)
State and foreign taxes, net of federal tax benefit and valuation allowance	1.0	(0.1)	1.2	0.1
Release of valuation allowance due to FTT acquisition	0.0	0.0	(3.4)	0.0
Global intangible low-taxed income	0.0	(0.3)	0.0	(0.2)
Nondeductible expenses and other	0.3	(0.3)	0.4	(0.2)
Impact of deferred tax liabilities for indefinite-lived assets	0.2	(0.8)	0.3	(0.4)
Increase in reserves for uncertain tax positions	1.3	1.1	2.9	1.4
Increase (decrease) in federal valuation allowance	(1.1)	1.3	(1.7)	0.6
Total income tax provision	$ 2.5	$ 0.1	$ 1.0	$ 1.0