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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

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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 48 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-48 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 49 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-49 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 + Details
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