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Other income/ (expense) items (Tables) | 12 Months Ended
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Dec. 31, 2017
Analysis of income and expense [abstract] |
Schedule of other income/ (expense) items | (a) Profit on sale of redundant site
| Credited to operating profit: |  |  |  |  |  |  |
| Profit on sale of redundant site |  | 0.4 |  |  | 2.1 |  |  | — |  |
|  |  | 0.4 |  |  | 2.1 |  |  | — |  |
(b) Changes to defined benefit pension plans
| Credited to operating profit: |  |  |  |  |  |  |
| Changes to defined benefit pension plans |  | — |  |  | 0.6 |  |  | 18.0 |  |
|  |  | — |  |  | 0.6 |  |  | 18.0 |  |
(c) Restructuring and other expense
| Charged to operating profit: |  |  |  |  |  |  |
| Rationalization of operations |  | (12.1 | ) |  | (0.4 | ) |  | (21.8 | ) |
| Patent infringement litigation costs |  | (3.5 | ) |  | (0.6 | ) |  | (0.5 | ) |
| Direct listing costs |  | (2.3 | ) |  | — |  |  | — |  |
| Non-current asset impairments |  | (3.7 | ) |  | — |  |  | — |  |
| Receivable impairment provision |  | — |  |  | (1.2 | ) |  | — |  |
| I.P.O. related share based compensation charges |  | — |  |  | — |  |  | (0.1 | ) |
|  |  | (21.6 | ) |  | (2.2 | ) |  | (22.4 | ) |
(d) Net gain / (loss) on acquisitions and disposals
| (Charged)/credited to non-operating profit: |  |  |  |  |  |  |
| Merger and acquisition costs |  | (0.9 | ) |  | (0.3 | ) |  | (2.0 | ) |
| Gain on bargain purchase |  | 1.2 |  |  | — |  |  | — |  |
| Remeasurement of deferred contingent consideration |  | 1.0 |  |  | 0.5 |  |  | — |  |
|  |  | 1.3 |  |  | 0.2 |  |  | (2.0 | ) |

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