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Segmental Information - Reconciliation of Consolidated Segment Income (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 27, 2020
Jun. 28, 2020
Mar. 29, 2020
Dec. 31, 2019
Sep. 29, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting [Abstract]                      
Adjusted EBITDA                 $ 53.9 $ 67.1 $ 79.6
Other share-based compensation charges                 (2.8) (4.5) (4.8)
Loss on disposal of property, plant and equipment                 (0.1) (0.2) (0.3)
Depreciation and amortization                 (13.3) (13.2) (16.9)
Unwind of discount on deferred consideration                 0.0 (0.2) (0.2)
Restructuring charges                 (8.9) (25.9) (13.2)
Impairment credit / (charge)                 0.0 0.2 (5.9)
Acquisition costs                 0.0 (1.4) (4.3)
Other charges                 (0.4) (2.5) 0.0
Defined benefits pension gain                 4.3 1.3 4.7
Interest expense, net                 (5.0) (4.4) (4.5)
Provision for income taxes                 (6.9) (7.6) (6.5)
Net income from continuing operations $ 6.6 $ 2.4 $ 4.6 $ 7.2 $ 1.6 $ 6.3 $ 4.1 $ (3.3) $ 20.8 $ 8.7 $ 27.7