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Segmental Information - Reconciliation of consolidated segment income (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 29, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jul. 01, 2018
Apr. 01, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting [Abstract]                      
Adjusted EBITDA                 $ 68.1 $ 79.6 $ 59.3
Other share-based compensation charges                 (4.5) (4.8) (2.2)
Loss on disposal of property, plant and equipment                 (0.2) (0.3) 0.0
Depreciation and amortization                 (15.3) (19.0) (18.3)
Unwind of discount on deferred consideration                 (0.2) (0.2) (0.2)
Restructuring charges                 (25.9) (13.4) (8.4)
Impairment charges $ (5.2)               (5.0) (7.2) (3.7)
Acquisition (costs) / credit                 (1.4) (4.3) 1.3
Other charges                 (2.5) 0.0 (5.8)
Defined benefits pension mark-to-market gain                 1.3 4.7 4.2
Interest expense, net                 (4.6) (4.6) (6.3)
Provision for income taxes                 (6.7) (5.5) (3.3)
Net income $ (2.4) $ 5.8 $ 3.5 $ (3.8) $ (8.5) $ 12.2 $ 11.4 $ 9.9 $ 3.1 $ 25.0 $ 16.6