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CAPITAL AND FINANCIAL RISK MANAGEMENT - Currency risk management (Details) - Currency risk $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Capital and financial risk management |
Percentage of strengthening in U.S. dollar | 10.00%
Percentage of weakening in U.S. dollar | 10.00%
Foreign currency forward and collar contracts |
Capital and financial risk management |
Percentage of strengthening in U.S. dollar | 10.00%
Percentage of weakening in U.S. dollar | 10.00%
Canadian dollar |
Capital and financial risk management |
Foreign currency net working capital | $ (43.7)
Strengthening in U.S dollar effect on earnings before taxes, gain (loss) | 4.0
Weakening in U.S dollar effect on earnings before taxes, gain (loss) | (4.9)
Brazilian real |
Capital and financial risk management |
Foreign currency net working capital | (158.9)
Strengthening in U.S dollar effect on earnings before taxes, gain (loss) | 14.4
Weakening in U.S dollar effect on earnings before taxes, gain (loss) | (17.7)
Chilean pesos |
Capital and financial risk management |
Foreign currency net working capital | (13.4)
Strengthening in U.S dollar effect on earnings before taxes, gain (loss) | 1.2
Weakening in U.S dollar effect on earnings before taxes, gain (loss) | (1.5)
Russian rouble |
Capital and financial risk management |
Foreign currency net working capital | 33.5
Strengthening in U.S dollar effect on earnings before taxes, gain (loss) | (3.0)
Weakening in U.S dollar effect on earnings before taxes, gain (loss) | 3.7
Mauritanian ouguiya |
Capital and financial risk management |
Foreign currency net working capital | 3.0
Strengthening in U.S dollar effect on earnings before taxes, gain (loss) | (0.3)
Weakening in U.S dollar effect on earnings before taxes, gain (loss) | 0.3
Ghanaian cedi |
Capital and financial risk management |
Foreign currency net working capital | 9.2
Strengthening in U.S dollar effect on earnings before taxes, gain (loss) | (0.8)
Weakening in U.S dollar effect on earnings before taxes, gain (loss) | 1.0
Other |
Capital and financial risk management |
Foreign currency net working capital | (1.7)
Strengthening in U.S dollar effect on earnings before taxes, gain (loss) | 0.2
Weakening in U.S dollar effect on earnings before taxes, gain (loss) | $ (0.2)

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