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Accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Accounting Policies [Abstract] |
Disclosure of intangible assets useful life | Where the recognition criteria are met, intangible assets are capitalized and amortized over their estimated useful economic lives from product launch, as shown in the table below. Intangible assets relating to products in development are subject to impairment testing at each balance sheet date or earlier upon indication of impairment.
| Technology and patents | 14 – 20 years |
| Tradenames and trademarks | 20 – 25 years |
| Customer relationships | 10 – 15 years |
| Backlogs and non-compete agreements | 5 – 6 years |
| Development costs | 5 – 10 years |
| Software | 4 – 7 years |
Disclosure of property, plant and equipment rate of annual charge | The rate of annual charge is summarized as follows:
| Freehold buildings | 3% – 10% |
| Leasehold land and buildings | The lesser of life of lease or freehold rate |
| Plant and equipment | 4% – 30% |
| Including: |  |
| Heavy production equipment (including casting, rolling, extrusion and press equipment) | 4% – 6% |
| Chemical production plant and robotics | 10% – 15% |
| Other production machinery | 10% – 20% |
| Furniture, fittings, storage and equipment | 10% – 30% |
|  | Freehold |  | Long leasehold |  | Short leasehold |  | Plant and equipment |  | Total |
|  | $M |  | $M |  | $M |  | $M |  | $M |
| Cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| At January 1, 2016 | 56.1 |  |  | 6.4 |  |  | 10.3 |  |  | 314.6 |  |  | 387.4 |  |
| Additions | 1.9 |  |  | 0.6 |  |  | 0.5 |  |  | 13.5 |  |  | 16.5 |  |
| Disposals | (3.8 | ) |  | — |  |  | — |  |  | (23.0 | ) |  | (26.8 | ) |
| Transfers | 3.8 |  |  | (0.2 | ) |  | — |  |  | (3.6 | ) |  | — |  |
| Exchange difference | (1.6 | ) |  | (0.9 | ) |  | (0.3 | ) |  | (25.3 | ) |  | (28.1 | ) |
| At December 31, 2016 | 56.4 |  |  | 5.9 |  |  | 10.5 |  |  | 276.2 |  |  | 349.0 |  |
| Additions | 0.9 |  |  | 0.3 |  |  | 0.9 |  |  | 7.1 |  |  | 9.2 |  |
| Acquired via acquisition | 2.0 |  |  | — |  |  | — |  |  | 3.2 |  |  | 5.2 |  |
| Disposals | (0.1 | ) |  | (0.1 | ) |  | — |  |  | (4.7 | ) |  | (4.9 | ) |
| Exchange difference | 3.2 |  |  | 0.1 |  |  | 0.8 |  |  | 14.2 |  |  | 18.3 |  |
| At December 31, 2017 | 62.4 |  |  | 6.2 |  |  | 12.2 |  |  | 296.0 |  |  | 376.8 |  |
| Accumulated depreciation and impairment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| At January 1, 2016 | 20.1 |  |  | 3.9 |  |  | 4.7 |  |  | 222.7 |  |  | 251.4 |  |
| Provided during the year | 2.0 |  |  | 0.3 |  |  | 0.8 |  |  | 13.6 |  |  | 16.7 |  |
| Disposals | (2.8 | ) |  | — |  |  | — |  |  | (22.8 | ) |  | (25.6 | ) |
| Transfers | 7.9 |  |  | (0.5 | ) |  | 0.2 |  |  | (7.6 | ) |  | — |  |
| Exchange difference | (0.6 | ) |  | (0.6 | ) |  | (0.2 | ) |  | (20.0 | ) |  | (21.4 | ) |
| At December 31, 2016 | 26.6 |  |  | 3.1 |  |  | 5.5 |  |  | 185.9 |  |  | 221.1 |  |
| Provided during the year | 2.2 |  |  | 0.3 |  |  | 0.9 |  |  | 13.3 |  |  | 16.7 |  |
| Disposals | (0.1 | ) |  | (0.1 | ) |  | — |  |  | (4.5 | ) |  | (4.7 | ) |
| Impairment | 2.5 |  |  | — |  |  | — |  |  | 2.5 |  |  | 5.0 |  |
| Exchange difference | 1.3 |  |  | 0.2 |  |  | 0.3 |  |  | 11.4 |  |  | 13.2 |  |
| At December 31, 2017 | 32.5 |  |  | 3.5 |  |  | 6.7 |  |  | 208.6 |  |  | 251.3 |  |
| Net book values: |  |  |  |  |  |  |  |  |  |  |  |  |  |
| At December 31, 2017 | 29.9 |  |  | 2.7 |  |  | 5.5 |  |  | 87.4 |  |  | 125.5 |  |
| At December 31, 2016 | 29.8 |  |  | 2.8 |  |  | 5.0 |  |  | 90.3 |  |  | 127.9 |  |
| At January 1, 2016 | 36.0 |  |  | 2.5 |  |  | 5.6 |  |  | 91.9 |  |  | 136.0 |  |
Schedule of changes in accounting policies |
| International Financial Reporting Standards | Effective date |
| IAS 7 | Statement of cash flows (Amendments) | January 1, 2017 |
| IAS 12 | Income taxes (Amendments) | January 1, 2017 |
The IASB has issued the following standards and amendments to standards with a mandatory effective date on or after January 1, 2018:
| International Financial Reporting Standards | Mandatory effective date |
| IFRS 2 | Share based payments (Amendments) | No earlier than January 1, 2018 |
| IFRS 15 | Revenue from Contracts with Customers | No earlier than January 1, 2018 |
| IFRS 9 | Financial Instruments | No earlier than January 1, 2018 |
| IFRS 16 | Leases | No earlier than January 1, 2019 |

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