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Financial risk management - Foreign currency risk (Details) - Currency risk - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of financial instruments by type of interest rate [line items] |  |
Net working capital asset | $ 85.3 | $ 75.3
Reasonably possible change in risk variable, percent | 10.00% |
Impact on value of net working capital | $ 8.5 | $ 7.5

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