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Intangible assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill | $ 80.6 | $ 87.0 |
Provided during the year |  | 1.7 | $ 2.2
Impairment | 2.0 | 0.0 | 3.7
Intangible assets and goodwill | 81.7 | 80.6 | 87.0
Goodwill |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill | 56.9 | 62.2 |
Intangible assets and goodwill | 59.6 | 56.9 | 62.2
Customer related |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill | 11.4 | 11.9 |
Intangible assets and goodwill | 10.5 | 11.4 | 11.9
Technology and trading related |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill | 6.1 | 7.5 |
Intangible assets and goodwill | 5.6 | 6.1 | 7.5
Development costs |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill | 5.5 | 3.9 |
Intangible assets and goodwill | 4.6 | 5.5 | 3.9
Development costs | Internally generated |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill | 5.5 |  |
Intangible assets and goodwill | 4.6 | 5.5 |
Software |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill | 0.7 | 1.5 |
Intangible assets and goodwill | 1.4 | 0.7 | 1.5
Cost |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill | 105.5 | 113.6 |
Additions | 1.7 | 2.7 |
Disposals | (0.5) | (0.6) |
Exchange difference | 5.5 | (10.2) |
Intangible assets and goodwill | 112.2 | 105.5 | 113.6
Cost | Goodwill |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill | 75.3 | 83.4 |
Additions | 0.0 | 0.1 |
Disposals | 0.0 | 0.0 |
Exchange difference | 4.1 | (8.2) |
Intangible assets and goodwill | 79.4 | 75.3 | 83.4
Cost | Customer related |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill | 13.5 | 13.4 |
Additions | 0.0 | 0.1 |
Disposals | (0.1) | 0.0 |
Exchange difference | 0.0 | 0.0 |
Intangible assets and goodwill | 13.4 | 13.5 | 13.4
Cost | Technology and trading related |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill | 8.0 | 9.3 |
Additions | 0.0 | 0.0 |
Disposals | 0.0 | 0.0 |
Exchange difference | 0.6 | (1.3) |
Intangible assets and goodwill | 8.6 | 8.0 | 9.3
Cost | Development costs |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill | 6.0 | 4.0 |
Additions | 0.9 | 2.4 |
Disposals | 0.0 | 0.0 |
Exchange difference | 0.5 | (0.4) |
Intangible assets and goodwill | 7.4 | 6.0 | 4.0
Cost | Software |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill | 2.7 | 3.5 |
Additions | 0.8 | 0.1 |
Disposals | (0.4) | (0.6) |
Exchange difference | 0.3 | (0.3) |
Intangible assets and goodwill | 3.4 | 2.7 | 3.5
Accumulated depreciation, amortisation and impairment |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill | (24.9) | (26.6) |
Provided during the year | 2.3 | 1.7 |
Disposals | (0.5) | (0.3) |
Impairment | 2.0 |  |
Exchange difference | (1.8) | 3.1 |
Intangible assets and goodwill | (30.5) | (24.9) | (26.6)
Accumulated depreciation, amortisation and impairment | Goodwill |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill | (18.4) | (21.2) |
Provided during the year | 0.0 | 0.0 |
Disposals | 0.0 | 0.0 |
Impairment | 0.0 |  |
Exchange difference | (1.4) | 2.8 |
Intangible assets and goodwill | (19.8) | (18.4) | (21.2)
Accumulated depreciation, amortisation and impairment | Customer related |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill | (2.1) | (1.5) |
Provided during the year | 0.9 | 0.7 |
Disposals | (0.1) | 0.0 |
Impairment | 0.0 |  |
Exchange difference | 0.0 | 0.1 |
Intangible assets and goodwill | (2.9) | (2.1) | (1.5)
Accumulated depreciation, amortisation and impairment | Technology and trading related |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill | (1.9) | (1.8) |
Provided during the year | 0.4 | 0.4 |
Disposals | 0.0 | 0.0 |
Impairment | 0.5 |  |
Exchange difference | (0.2) | 0.3 |
Intangible assets and goodwill | (3.0) | (1.9) | (1.8)
Accumulated depreciation, amortisation and impairment | Development costs |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill | (0.5) | (0.1) |
Provided during the year | 0.7 | 0.3 |
Disposals | 0.0 | 0.0 |
Impairment | 1.5 |  |
Exchange difference | (0.1) | (0.1) |
Intangible assets and goodwill | (2.8) | (0.5) | (0.1)
Accumulated depreciation, amortisation and impairment | Software |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill | (2.0) | (2.0) |
Provided during the year | 0.3 | 0.3 |
Disposals | (0.4) | (0.3) |
Impairment | 0.0 |  |
Exchange difference | (0.1) | 0.0 |
Intangible assets and goodwill | $ (2.0) | $ (2.0) | $ (2.0)

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