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Segmental Information - Reconciliation of consolidated segment income (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting [Abstract]                      
Adjusted EBITDA                 $ 79.6 $ 59.3 $ 51.3
Other share-based compensation charges                 (4.8) (2.2) (1.4)
Loss on disposal of property, plant and equipment                 (0.3) 0.0 (0.2)
Depreciation and amortization                 (19.0) (18.3) (18.0)
Unwind of discount on deferred consideration                 (0.2) (0.2) (0.4)
Restructuring charges                 (13.4) (8.4) (0.4)
Impairment charges                 (7.2) (3.7) 0.0
Acquisition (costs) / credit                 (4.3) 1.3 0.0
Other charges                 0.0 (5.8) 0.0
Other general income                 0.0 0.0 2.5
Defined benefits pension mark-to-market gain / (loss)                 4.7 4.2 (2.8)
Interest expense, net                 (4.6) (6.3) (6.0)
Provision for income taxes                 (5.5) (3.3) (6.8)
Net income $ (8.5) $ 12.2 $ 11.4 $ 9.9 $ (1.0) $ 5.8 $ 3.9 $ 7.9 $ 25.0 $ 16.6 $ 17.8