Income Taxes - Income Tax Provision Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 25, 2023	Jun. 26, 2022	Jun. 25, 2023	Jun. 26, 2022
Income Tax Disclosure [Abstract]
Income tax expense (benefit) at federal statutory rate	$ 0.4	$ (1.0)	$ (0.7)	$ (5.2)
Nondeductible expenses and other	1.9	1.5	3.5	2.5
Stock compensation - excess tax shortfalls (benefits)	0.3	0.3	0.7	(0.6)
Federal impact of research & development tax credits	(0.2)	(0.3)	(0.4)	(0.5)
Provision (benefit) for income taxes from continuing operations	$ 2.4	$ 0.5	$ 3.1	$ (3.8)

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
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-Name Accounting Standards Codification
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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

+ References

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other nondeductible expenses.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for award under share-based payment arrangement. Includes, but is not limited to, expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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