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FINANCIAL RISK MANAGEMENT - Metal and input price risk (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Gold |  |
FINANCIAL RISK MANAGEMENT |  |
Impact on net earnings due to 10 % change in price | $ 19.0 | $ 37.6
Impact on other comprehensive income due to 10 % change in price | 0.0 | 0.0
Copper |  |
FINANCIAL RISK MANAGEMENT |  |
Impact on net earnings due to 10 % change in price | 20.7 | 6.5
Impact on other comprehensive income due to 10 % change in price | 0.0 | 0.0
Fuels and electricity |  |
FINANCIAL RISK MANAGEMENT |  |
Impact on net earnings due to 10 % change in price | 7.0 | $ 5.5
Impact on other comprehensive income due to 10 % change in price | $ 0.0 |

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