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Segmental Information - Reconciliation of consolidated segment income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jul. 01, 2018
Apr. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Segment Reporting [Abstract]            
Adjusted EBITDA $ 20.2   $ 21.4   $ 38.7 $ 40.6
Other share-based compensation charges (0.8)   (1.4)   (3.4) (1.9)
Depreciation and amortization (4.0)   (4.9)   (7.7) (9.8)
Unwind discount on deferred consideration (0.1)   (0.2)   (0.1) (0.3)
Restructuring charges (12.7)   (0.3)   (21.7) (1.0)
Fair value adjustment to held-for-sale assets 0.0   0.0   0.2 0.0
Acquisition and disposal related gains / (costs) 2.9   0.0   (1.7) 0.0
Defined benefits pension mark-to-market gain 0.5   1.2   1.1 2.6
Interest expense, net (1.1)   (1.0)   (2.2) (2.5)
Provision for income taxes (1.4)   (3.4)   (3.5) (6.4)
Net income / (loss) $ 3.5 $ (3.8) $ 11.4 $ 9.9 $ (0.3) $ 21.3