Segmental Information - Reconciliation of Consolidated Segment Income (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jul. 02, 2023	Jun. 26, 2022	Jul. 02, 2023	Jun. 26, 2022
Segment Reporting [Abstract]
Adjusted EBITDA	$ 14.4	$ 16.9	$ 25.7	$ 33.0
Other share-based compensation charges	(0.7)	(0.7)	(1.3)	(0.9)
Depreciation and amortization	(3.3)	(3.4)	(6.6)	(7.1)
Gain on disposal of property, plant and equipment	0.0	0.2	0.0	0.2
Restructuring charges	(2.5)	(0.3)	(2.8)	(1.7)
Acquisition and disposal related costs	0.0	(0.1)	0.0	(0.3)
Defined benefits pension credit / (charge)	0.6	0.3	(8.3)	0.7
Interest expense, net	(1.8)	(0.9)	(3.1)	(1.7)
Net income from continuing operations	$ 6.7	$ 12.0	$ 3.6	$ 22.2

Acquisition and Disposals Related Credits (Costs)

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- Definition

Adjusted EBITDA

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No definition available.

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- Definition

Allocated Share-based Compensation Expense, Other

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No definition available.

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- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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- Definition

Amount, before tax, of income (loss) attributable to noncontrolling interest. Includes, but is not limited to, income (loss) from continuing operations, discontinued operations and equity method investments.

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The net amount of operating interest income (expense).

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- Definition

Amount of expense (reversal of expense) for net periodic benefit cost components, excluding service cost component, of defined benefit plan. Amount includes, but is not limited to, interest cost, expected (return) loss on plan asset, amortization of prior service cost (credit), amortization of (gain) loss, amortization of transition (asset) obligation, settlement (gain) loss, curtailment (gain) loss and certain termination benefits.

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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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