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Segmental Information - Reconciliation of Consolidated Segment Income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Oct. 01, 2023
Sep. 25, 2022
Oct. 01, 2023
Sep. 25, 2022
Segment Reporting [Abstract]        
Adjusted EBITDA $ 6.0 $ 16.1 $ 31.7 $ 49.1
Other share-based compensation charges (0.7) (0.9) (2.0) (1.8)
Depreciation and amortization (3.2) (3.3) (9.8) (10.4)
Gain on disposal of property, plant and equipment 0.0 0.0 0.0 0.2
Restructuring charges (1.6) (0.3) (4.4) (2.0)
Acquisition and disposal related costs 0.0 0.0 0.0 (0.3)
Defined benefits pension credit / (charge) 0.3 0.2 (8.0) 0.9
Interest expense, net (1.6) (1.0) (4.7) (2.7)
Net (loss) / income before income taxes from continuing operations $ (0.8) $ 10.8 $ 2.8 $ 33.0