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FAIR VALUE MEASUREMENT - Foreign currency forward and collar contracts (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) R$ / $ ₽ / $ $ / $ | Dec. 31, 2019 USD ($)
Derivative Contracts |  |
Financial Instruments |  |
Unrealized Gain (loss) on Derivative Financial Instruments | $ 2.2 | $ 5.8
Foreign currency forward and collar contracts |  |
Financial Instruments |  |
Unrealized Gain (loss) on Derivative Financial Instruments | (2.5) | 2.6
Brazilian real zero cost collar contracts |  |
Financial Instruments |  |
Unrealized Gain (loss) on Derivative Financial Instruments | (5.8) | (0.1)
Brazilian real zero cost collar contracts | 2021 |  |
Financial Instruments |  |
Foreign currency net working capital | 103.6 |
Brazilian real zero cost collar contracts | 2022 |  |
Financial Instruments |  |
Foreign currency net working capital | 64.8 |
Brazilian real zero cost collar contracts | 2023 |  |
Financial Instruments |  |
Foreign currency net working capital | 43.2 |
Brazilian real zero cost collar contracts | From 2021 to 2023 |  |
Financial Instruments |  |
New derivative contracts | 134.4 |
Canadian dollar forward buy contracts |  |
Financial Instruments |  |
Unrealized Gain (loss) on Derivative Financial Instruments | 2.2 | 0.5
Canadian dollar forward buy contracts | 2021 |  |
Financial Instruments |  |
Foreign currency net working capital | $ 25.2 |
Average price | $ / $ | 1.37 |
Canadian dollar forward buy contracts | 2022 |  |
Financial Instruments |  |
Foreign currency net working capital | $ 12.0 |
Average price | $ / $ | 1.40 |
Canadian dollar forward buy contracts | From 2021 to 2022 |  |
Financial Instruments |  |
New derivative contracts | $ 25.2 |
Average price | $ / $ | 1.40 |
Russian rouble zero cost collar contracts |  |
Financial Instruments |  |
New derivative contracts | $ 82.8 |
Unrealized Gain (loss) on Derivative Financial Instruments | 1.1 | $ 2.2
Russian rouble zero cost collar contracts | 2021 |  |
Financial Instruments |  |
Foreign currency net working capital | 51.6 |
Russian rouble zero cost collar contracts | 2022 |  |
Financial Instruments |  |
Foreign currency net working capital | 36.0 |
Russian rouble zero cost collar contracts | 2023 |  |
Financial Instruments |  |
Foreign currency net working capital | $ 20.4 |
Put | Brazilian real forward buy contracts | 2021 |  |
Financial Instruments |  |
Average price | R$ / $ | 4.35 |
Put | Brazilian real forward buy contracts | 2022 |  |
Financial Instruments |  |
Average price | R$ / $ | 4.62 |
Put | Brazilian real forward buy contracts | 2023 |  |
Financial Instruments |  |
Average price | R$ / $ | 5.00 |
Put | Brazilian real forward buy contracts | From 2021 to 2023 |  |
Financial Instruments |  |
Average price | R$ / $ | 4.81 |
Put | Russian rouble zero cost collar contracts |  |
Financial Instruments |  |
Average price | ₽ / $ | 75.35 |
Put | Russian rouble zero cost collar contracts | 2021 |  |
Financial Instruments |  |
Average price | ₽ / $ | 70.3 |
Put | Russian rouble zero cost collar contracts | 2022 |  |
Financial Instruments |  |
Average price | ₽ / $ | 75.0 |
Put | Russian rouble zero cost collar contracts | 2023 |  |
Financial Instruments |  |
Average price | ₽ / $ | 77.0 |
Call | Brazilian real forward buy contracts | 2021 |  |
Financial Instruments |  |
Average price | R$ / $ | 5.39 |
Call | Brazilian real forward buy contracts | 2022 |  |
Financial Instruments |  |
Average price | R$ / $ | 6.56 |
Call | Brazilian real forward buy contracts | 2023 |  |
Financial Instruments |  |
Average price | R$ / $ | 7.26 |
Call | Brazilian real forward buy contracts | From 2021 to 2023 |  |
Financial Instruments |  |
Average price | R$ / $ | 6.94 |
Call | Russian rouble zero cost collar contracts |  |
Financial Instruments |  |
Average price | ₽ / $ | 96.93 |
Call | Russian rouble zero cost collar contracts | 2021 |  |
Financial Instruments |  |
Average price | ₽ / $ | 87.8 |
Call | Russian rouble zero cost collar contracts | 2022 |  |
Financial Instruments |  |
Average price | ₽ / $ | 100.6 |
Call | Russian rouble zero cost collar contracts | 2023 |  |
Financial Instruments |  |
Average price | ₽ / $ | 97.8 |

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