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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, 2018 USD ($) ₽ / $ $ / $ R$ / $ | Dec. 31, 2017 USD ($)
Brazilian real forward buy contracts |  |
Financial Instruments |  |
Unrealized gain (loss) on derivative instruments | $ (1.7) | $ 0.7
Brazilian real forward buy contracts | 2019 |  |
Financial Instruments |  |
Financial assets | $ 36.0 |
Average price | R$ / $ | 3.66 |
Brazilian real zero cost collar contracts |  |
Financial Instruments |  |
Unrealized gain (loss) on derivative instruments | $ (7.5) | 1.8
Brazilian real zero cost collar contracts | 2019 |  |
Financial Instruments |  |
Financial assets | 134.4 |
Brazilian real zero cost collar contracts | 2020 |  |
Financial Instruments |  |
Financial assets | 95.6 |
Brazilian real zero cost collar contracts | 2021 |  |
Financial Instruments |  |
Financial assets | $ 12.4 |
Brazilian real zero cost collar contracts | Put | 2019 |  |
Financial Instruments |  |
Average price | R$ / $ | 3.45 |
Brazilian real zero cost collar contracts | Put | 2020 |  |
Financial Instruments |  |
Average price | R$ / $ | 3.73 |
Brazilian real zero cost collar contracts | Put | 2021 |  |
Financial Instruments |  |
Average price | R$ / $ | 4.10 |
Brazilian real zero cost collar contracts | Put | From 2018 to 2021 |  |
Financial Instruments |  |
Financial assets | $ 212.4 |
Average price | R$ / $ | 3.59 |
Brazilian real zero cost collar contracts | Call | 2019 |  |
Financial Instruments |  |
Average price | R$ / $ | 3.75 |
Brazilian real zero cost collar contracts | Call | 2020 |  |
Financial Instruments |  |
Average price | R$ / $ | 4.18 |
Brazilian real zero cost collar contracts | Call | 2021 |  |
Financial Instruments |  |
Average price | R$ / $ | 5.10 |
Brazilian real zero cost collar contracts | Call | From 2018 to 2021 |  |
Financial Instruments |  |
Average price | R$ / $ | 4.05 |
Canadian dollar forward buy contracts |  |
Financial Instruments |  |
Unrealized gain (loss) on derivative instruments | $ (3.5) | (2.6)
Canadian dollar forward buy contracts | 2019 |  |
Financial Instruments |  |
Financial assets | $ 58.5 |
Average price | $ / $ | 1.28 |
Canadian dollar forward buy contracts | 2020 |  |
Financial Instruments |  |
Financial assets | $ 14.4 |
Average price | $ / $ | 1.31 |
Russian rouble zero cost collar contracts |  |
Financial Instruments |  |
Unrealized gain (loss) on derivative instruments | $ (3.3) | $ 0.7
Russian rouble zero cost collar contracts | 2019 |  |
Financial Instruments |  |
Financial assets | 54.0 |
Russian rouble zero cost collar contracts | 2020 |  |
Financial Instruments |  |
Financial assets | $ 13.5 |
Russian rouble zero cost collar contracts | Put | 2019 |  |
Financial Instruments |  |
Average price | ₽ / $ | 58.9 |
Russian rouble zero cost collar contracts | Put | 2020 |  |
Financial Instruments |  |
Average price | ₽ / $ | 65.0 |
Russian rouble zero cost collar contracts | Call | 2019 |  |
Financial Instruments |  |
Average price | ₽ / $ | 69.6 |
Russian rouble zero cost collar contracts | Call | 2020 |  |
Financial Instruments |  |
Average price | ₽ / $ | 78.4 |
Canadian dollar new forward buy contracts | From 2018 to 2020 |  |
Financial Instruments |  |
Financial assets | $ 71.7 |
Average price | $ / $ | 1.29 |
Brazilian real new forward buy contracts | From 2018 to 2019 |  |
Financial Instruments |  |
Financial assets | $ 288.9 |
Average price | R$ / $ | 3.35 |
Russian rouble new forward buy contracts | 2018 |  |
Financial Instruments |  |
Financial assets | $ 27.0 |
Average price | ₽ / $ | 61.2 |
Russian new rouble zero cost collar contracts | 2020 |  |
Financial Instruments |  |
Financial assets | $ 67.5 |
Russian new rouble zero cost collar contracts | Put | 2020 |  |
Financial Instruments |  |
Average price | ₽ / $ | 60.2 |
Russian new rouble zero cost collar contracts | Call | 2020 |  |
Financial Instruments |  |
Average price | ₽ / $ | 71.4 |

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