Segmental Information - Reconciliation of consolidated segment income (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Segment Reporting [Abstract]
Adjusted EBITDA	$ 15.3	$ 6.0	$ 41.5	$ 31.7
Other share-based compensation charges	(0.7)	(0.7)	(2.1)	(2.0)
Gain on disposal of assets held-for-sale	6.1	0.0	6.1	0.0
Depreciation and amortization	(2.6)	(3.2)	(7.5)	(9.8)
Loss on disposal of property, plant and equipment	(0.1)	0.0	(0.1)	0.0
Restructuring charges	(0.5)	(1.6)	(2.3)	(4.4)
Acquisition and disposal related costs	(0.1)	0.0	(9.5)	0.0
Defined benefits pension credit / (charge)	0.3	0.3	0.8	(8.0)
Interest expense, net	(1.4)	(1.6)	(4.1)	(4.7)
Net income before income taxes from continuing operations	$ 16.3	$ (0.8)	$ 22.8	$ 2.8

Adjusted EBITDA

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- Definition

Allocated Share-based Compensation Expense, Other

+ References

No definition available.

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- Definition

Disposal Group, Not Discontinued Operation, Disposal Cost And Loss (Gain) On Write-Down

+ References

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.

+ References

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- Definition

Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

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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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- Definition

Amount of interest income (expense) classified as operating.

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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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