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Income Taxes - Income Tax Provision Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Income Tax Disclosure [Abstract]
Income tax benefit at federal statutory rate	$ (0.5)	$ (0.5)	$ (0.7)	$ (0.8)
State and foreign taxes, net of federal tax benefit and valuation allowance	(1.5)	(0.4)	(1.5)	(0.7)
Release of valuation allowance due to acquisitions	0.0	0.0	0.0	(0.9)
Nondeductible expenses and other	(2.0)	(1.2)	(2.2)	(1.3)
Impact of deferred tax liabilities for indefinite-lived assets	0.0	(0.6)	0.0	(0.6)
Increase (decrease) in reserves for uncertain tax positions	0.1	(0.8)	0.1	(1.0)
Stock compensation - excess tax benefits	(0.2)	0.0	(2.6)	0.0
Federal impact of research & development tax credits	0.5	0.0	0.6	0.0
Increase in federal valuation allowance	0.0	1.7	0.0	2.1
Benefit for income taxes from continuing operations	$ (3.6)	$ (1.8)	$ (6.3)	$ (3.2)

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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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