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Financial instruments - Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | $ 240.3 | $ 249.6 | $ 266.0
At fair value | Level 3 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 1.0 | $ 2.8 | $ 2.9
At fair value | Forward foreign currency exchange rate contracts |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 0.7 |  |
At fair value | Forward foreign currency exchange rate contracts | Level 1 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 0.0 |  |
At fair value | Forward foreign currency exchange rate contracts | Level 2 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 0.7 |  |
At fair value | Forward foreign currency exchange rate contracts | Level 3 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 0.0 |  |
At fair value | LME derivative contracts |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | (1.2) |  |
At fair value | LME derivative contracts | Level 1 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 0.0 |  |
At fair value | LME derivative contracts | Level 2 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | (1.2) |  |
At fair value | LME derivative contracts | Level 3 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 0.0 |  |
At fair value | Loan Notes due 2018 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 15.3 |  |
At fair value | Loan Notes due 2018 | Level 1 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 0.0 |  |
At fair value | Loan Notes due 2018 | Level 2 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 15.3 |  |
At fair value | Loan Notes due 2018 | Level 3 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 0.0 |  |
At fair value | Loan Notes due 2021 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 25.2 |  |
At fair value | Loan Notes due 2021 | Level 1 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 0.0 |  |
At fair value | Loan Notes due 2021 | Level 2 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 25.2 |  |
At fair value | Loan Notes due 2021 | Level 3 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 0.0 |  |
At fair value | Loan Notes due 2023 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 26.6 |  |
At fair value | Loan Notes due 2023 | Level 1 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 0.0 |  |
At fair value | Loan Notes due 2023 | Level 2 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 26.6 |  |
At fair value | Loan Notes due 2023 | Level 3 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 0.0 |  |
At fair value | Loan Notes due 2026 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 27.1 |  |
At fair value | Loan Notes due 2026 | Level 1 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 0.0 |  |
At fair value | Loan Notes due 2026 | Level 2 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 27.1 |  |
At fair value | Loan Notes due 2026 | Level 3 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 0.0 |  |
At fair value | Revolving credit facility |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 21.3 |  |
At fair value | Revolving credit facility | Level 1 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 0.0 |  |
At fair value | Revolving credit facility | Level 2 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 21.3 |  |
At fair value | Revolving credit facility | Level 3 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 0.0 |  |
At fair value | Deferred contingent consideration |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 0.7 |  |
At fair value | Deferred contingent consideration | Level 1 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 0.0 |  |
At fair value | Deferred contingent consideration | Level 2 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 0.0 |  |
At fair value | Deferred contingent consideration | Level 3 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 0.7 |  |
At fair value | Deferred consideration |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 0.3 |  |
At fair value | Deferred consideration | Level 1 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 0.0 |  |
At fair value | Deferred consideration | Level 2 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | 0.0 |  |
At fair value | Deferred consideration | Level 3 |  |  |
Disclosure of fair value measurement of liabilities [line items] |  |  |
Liabilities | $ 0.3 |  |

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