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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, 2019 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 | $ (26.3)
Strengthening in U.S dollar effect on earnings before taxes, gain (loss) | 2.4
Weakening in U.S dollar effect on earnings before taxes, gain (loss) | (2.9)
Brazilian real |
Capital and financial risk management |
Foreign currency net working capital | (91.3)
Strengthening in U.S dollar effect on earnings before taxes, gain (loss) | 8.3
Weakening in U.S dollar effect on earnings before taxes, gain (loss) | (10.1)
Chilean pesos |
Capital and financial risk management |
Foreign currency net working capital | (5.0)
Strengthening in U.S dollar effect on earnings before taxes, gain (loss) | 0.5
Weakening in U.S dollar effect on earnings before taxes, gain (loss) | (0.6)
Russian rouble |
Capital and financial risk management |
Foreign currency net working capital | 33.4
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 | (68.1)
Strengthening in U.S dollar effect on earnings before taxes, gain (loss) | 6.2
Weakening in U.S dollar effect on earnings before taxes, gain (loss) | (7.6)
Other |
Capital and financial risk management |
Foreign currency net working capital | 7.0
Strengthening in U.S dollar effect on earnings before taxes, gain (loss) | (0.6)
Weakening in U.S dollar effect on earnings before taxes, gain (loss) | $ 0.8

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