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CAPITAL AND FINANCIAL RISK MANAGEMENT - Currency risk management (Details) $ in Millions | Dec. 31, 2017 USD ($)
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Currency risk |
Capital and financial risk management |
Percentage of strengthening in U.S. dollar | 10.00%
Percentage of weakening in U.S. dollar | 10.00%
Currency risk | Canadian dollars |
Capital and financial risk management |
Foreign currency net working capital | $ (24.5)
Currency risk | Brazilian reais |
Capital and financial risk management |
Foreign currency net working capital | (37.2)
Currency risk | Chilean pesos |
Capital and financial risk management |
Foreign currency net working capital | (15.5)
Currency risk | Russian roubles |
Capital and financial risk management |
Foreign currency net working capital | 14.9
Currency risk | Euros |
Capital and financial risk management |
Foreign currency net working capital | (3.1)
Currency risk | Mauritanian ouguiya |
Capital and financial risk management |
Foreign currency net working capital | (21.8)
Currency risk | Ghanaian cedi |
Capital and financial risk management |
Foreign currency net working capital | 12.9
Currency risk | Other |
Capital and financial risk management |
Foreign currency net working capital | (0.8)
10% strengthening in U.S. dollar | Canadian dollars |
Capital and financial risk management |
Strengthening in U.S dollar effect on earnings before taxes, gain (loss) | 2.2
10% strengthening in U.S. dollar | Brazilian reais |
Capital and financial risk management |
Strengthening in U.S dollar effect on earnings before taxes, gain (loss) | 3.4
10% strengthening in U.S. dollar | Chilean pesos |
Capital and financial risk management |
Strengthening in U.S dollar effect on earnings before taxes, gain (loss) | 1.4
10% strengthening in U.S. dollar | Russian roubles |
Capital and financial risk management |
Strengthening in U.S dollar effect on earnings before taxes, gain (loss) | (1.4)
10% strengthening in U.S. dollar | Euros |
Capital and financial risk management |
Strengthening in U.S dollar effect on earnings before taxes, gain (loss) | 0.3
10% strengthening in U.S. dollar | Mauritanian ouguiya |
Capital and financial risk management |
Strengthening in U.S dollar effect on earnings before taxes, gain (loss) | 2.0
10% strengthening in U.S. dollar | Ghanaian cedi |
Capital and financial risk management |
Strengthening in U.S dollar effect on earnings before taxes, gain (loss) | (1.2)
10% strengthening in U.S. dollar | Other |
Capital and financial risk management |
Strengthening in U.S dollar effect on earnings before taxes, gain (loss) | 0.1
10% weakening in U.S. dollar | Canadian dollars |
Capital and financial risk management |
Weakening in U.S dollar effect on earnings before taxes, gain (loss) | (2.7)
10% weakening in U.S. dollar | Brazilian reais |
Capital and financial risk management |
Weakening in U.S dollar effect on earnings before taxes, gain (loss) | (4.1)
10% weakening in U.S. dollar | Chilean pesos |
Capital and financial risk management |
Weakening in U.S dollar effect on earnings before taxes, gain (loss) | (1.7)
10% weakening in U.S. dollar | Russian roubles |
Capital and financial risk management |
Weakening in U.S dollar effect on earnings before taxes, gain (loss) | 1.7
10% weakening in U.S. dollar | Euros |
Capital and financial risk management |
Weakening in U.S dollar effect on earnings before taxes, gain (loss) | (0.3)
10% weakening in U.S. dollar | Mauritanian ouguiya |
Capital and financial risk management |
Weakening in U.S dollar effect on earnings before taxes, gain (loss) | (2.4)
10% weakening in U.S. dollar | Ghanaian cedi |
Capital and financial risk management |
Weakening in U.S dollar effect on earnings before taxes, gain (loss) | 1.4
10% weakening in U.S. dollar | Other |
Capital and financial risk management |
Weakening in U.S dollar effect on earnings before taxes, gain (loss) | $ (0.1)

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