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Financial risk management objectives and policies - Narrative (Details) € in Millions, £ in Millions | 12 Months Ended |  |  |  |  |  |  |  |  |  |
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Dec. 31, 2017 USD ($) $ / € € / $ £ / $ T | Dec. 31, 2017 GBP (£) $ / € € / $ £ / $ T | Dec. 31, 2016 USD ($) € / $ £ / $ | Dec. 31, 2015 USD ($) | Dec. 31, 2017 EUR (€) £ / $ | Dec. 31, 2017 GBP (£) £ / $ | Jun. 30, 2015 $ / £ | Mar. 31, 2015 $ / £ | Feb. 28, 2015 $ / £ | Aug. 31, 2014 $ / £ | May 31, 2014 $ / £ | Jan. 31, 2014 $ / £ | Mar. 31, 2013 $ / £ | Oct. 31, 2012 $ / £ | Feb. 28, 2007 $ / £
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA to net debt ratio target | 1.6 | 1.6 | 1.9 | 1.5 |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 441,300,000 |  | $ 414,800,000 | $ 460,300,000 |  |  |  |  |  |  |  |  |  |  |
Operating profit | 19,300,000 |  | 35,800,000 | 37,900,000 |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA | $ 61,800,000 |  | 55,300,000 | 62,200,000 |  |  |  |  |  |  |  |  |  |  |
Capital employed | £ |  |  |  |  |  | £ 81.8 |  |  |  |  |  |  |  |  |
Closing foreign exchange rate (in GBP or EUR to USD) | 0.7401 |  |  |  | 0.7401 | 0.7401 | 1.5715 | 1.4847 | 1.5436 | 1.6580 | 1.6760 | 1.6487 | 1.5173 | 1.6129 | 1.9613
Foreign exchange transaction gain | $ 0 |  | 700,000 | 600,000 |  |  |  |  |  |  |  |  |  |  |
Euro |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | 28,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA | 2,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
United Kingdom |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | 139,500,000 |  | 114,000,000 | 118,000,000 |  |  |  |  |  |  |  |  |  |  |
Operating profit | (5,100,000) |  | 12,200,000 | 16,500,000 |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA | 16,200,000 |  | 17,400,000 | 13,600,000 |  |  |  |  |  |  |  |  |  |  |
Trade receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for bad and doubtful debtors of financial assets | 4,100,000 |  | 2,100,000 | $ 4,800,000 |  |  |  |  |  |  |  |  |  |  |
Impairment charge on financial assets | 2,700,000 |  | $ 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | 150,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sensitivity analysis for reasonably possible change in exchange rate, increase (decrease) in interest cost | $ 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidity risk | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forecast period for cash flow monitoring | 6 months | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidity risk | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forecast period for cash flow monitoring | 18 months | 18 months |  |  |  |  |  |  |  |  |  |  |  |  |
Credit risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk exposure associated with customer spread | 25.00% | 25.00% | 27.00% | 27.00% |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation risk | GBP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average foreign exchange rate (in GBP or EUR to USD) | £ / $ | 0.7682 | 0.7682 | 0.7438 |  |  |  |  |  |  |  |  |  |  |  |
Gains (losses) on exchange rate impact recognized in revenue | $ 4,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains (losses) on exchange rate impact recognized in operating profit | (200,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains (losses) on exchange rate impact recognized in adjusted EBITDA | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sensitivity analysis for reasonably possible change in exchange rate (in USD to GBP) | £ / $ | 0.05 | 0.05 |  |  |  |  |  |  |  |  |  |  |  |  |
Sensitivity analysis for reasonably possible change in exchange rate, increase (decrease) on revenue | £ |  | £ 8.5 |  |  |  |  |  |  |  |  |  |  |  |  |
Sensitivity analysis for reasonably possible change in exchange rate, increase (decrease) on profit (loss) | £ |  | (0.3) |  |  |  |  |  |  |  |  |  |  |  |  |
Sensitivity analysis for reasonably possible change in exchange rate, increase (decrease) on adjusted EBITDA | £ |  | 1.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Sensitivity analysis for reasonably possible change in exchange rate, increase (decrease) on capital employed | £ |  | £ 5.2 |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation risk | Euro |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average foreign exchange rate (in GBP or EUR to USD) | € / $ | 0.8788 | 0.8788 | 0.9061 |  |  |  |  |  |  |  |  |  |  |  |
Gains (losses) on exchange rate impact recognized in revenue | $ (891,568.0473372781) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains (losses) on exchange rate impact recognized in operating profit | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains (losses) on exchange rate impact recognized in adjusted EBITDA | $ (100,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sensitivity analysis for reasonably possible change in exchange rate (in USD to GBP) | € / $ | 0.05 | 0.05 |  |  |  |  |  |  |  |  |  |  |  |  |
Sensitivity analysis for reasonably possible change in exchange rate, increase (decrease) on revenue | £ |  | £ 1.5 |  |  |  |  |  |  |  |  |  |  |  |  |
Sensitivity analysis for reasonably possible change in exchange rate, increase (decrease) on adjusted EBITDA | £ |  | £ 0.1 |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency transaction risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange transaction gain | $ 5,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange transaction loss | $ 2,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency transaction risk | Euro |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sensitivity analysis for reasonably possible change in exchange rate (in USD to GBP) | € / $ | 0.10 | 0.10 |  |  |  |  |  |  |  |  |  |  |  |  |
Sensitivity analysis for reasonably possible change in exchange rate, increase (decrease) on profit (loss) | $ (5,500,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk exposure | $ 54,000,000 |  |  |  | € 54.0 |  |  |  |  |  |  |  |  |  |
Foreign currency transaction risk | USD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sensitivity analysis for reasonably possible change in exchange rate (in USD to GBP) | $ / € | 0.10 | 0.10 |  |  |  |  |  |  |  |  |  |  |  |  |
Sensitivity analysis for reasonably possible change in exchange rate, increase (decrease) on profit (loss) | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk exposure | 14,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity price risk | Aluminum contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk exposure | $ 80,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of commodity purchases (in metric tons) | T | 12,500 | 12,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Average rate of hedging instrument | 32.00% |  |  |  | 32.00% | 32.00% |  |  |  |  |  |  |  |  |
Sensitivity analysis for reasonably possible change in exchange rate, commodity price | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sensitivity analysis for reasonably possible change in exchange rate, increase (decrease) on division costs | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity price risk | Magnesium contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk exposure | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of commodity purchases (in metric tons) | T | 6,000 | 6,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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