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Income Taxes - Income Tax Provision Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 28, 2021	Mar. 29, 2020
Income Tax Disclosure [Abstract]
Income tax at federal statutory rate	$ (0.2)	$ (0.3)
State and foreign taxes, net of federal tax benefit and valuation allowance	0.0	(0.3)
Release of valuation allowance due to acquisitions	0.0	(0.9)
Nondeductible expenses and other	(0.2)	(0.1)
Decrease in reserves for uncertain tax positions	0.0	(0.2)
Stock compensation - excess tax benefits	(2.4)	0.0
Federal impact of research & development tax credits	0.1	0.0
Increase in federal valuation allowance	0.0	0.4
Benefit for income taxes from continuing operations	$ (2.7)	$ (1.4)

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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