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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, 2017 USD ($) ₽ / $ $ / $ R$ / $ | Dec. 31, 2016 USD ($)
Brazilian real forward buy contracts |  |
Financial Instruments |  |
Unrealized gain (loss) on derivative instruments | $ (0.7) | $ 0.0
Brazilian real forward buy contracts | 2018 |  |
Financial Instruments |  |
Financial assets | $ 69.6 |
Average price | R$ / $ | 3.32 |
Brazilian real zero cost collars |  |
Financial Instruments |  |
Unrealized gain (loss) on derivative instruments | $ 1.8 | 6.0
Brazilian real zero cost collars | 2018 |  |
Financial Instruments |  |
Financial assets | 25.2 |
Brazilian real zero cost collars | 2019 |  |
Financial Instruments |  |
Financial assets | $ 60.0 |
Brazilian real zero cost collars | Put | 2018 |  |
Financial Instruments |  |
Average price | R$ / $ | 3.75 |
Brazilian real zero cost collars | Put | 2019 |  |
Financial Instruments |  |
Average price | R$ / $ | 3.45 |
Brazilian real zero cost collars | Call | 2018 |  |
Financial Instruments |  |
Average price | R$ / $ | 4.12 |
Brazilian real zero cost collars | Call | 2019 |  |
Financial Instruments |  |
Average price | R$ / $ | 3.64 |
Canadian dollar forward buy contracts |  |
Financial Instruments |  |
Unrealized gain (loss) on derivative instruments | $ 2.6 | (0.2)
Canadian dollar forward buy contracts | 2018 |  |
Financial Instruments |  |
Financial assets | $ 40.5 |
Average price | $ / $ | 1.35 |
Canadian dollar forward buy contracts | 2019 |  |
Financial Instruments |  |
Financial assets | $ 18.0 |
Average price | $ / $ | 1.28 |
Russian rouble zero cost collars |  |
Financial Instruments |  |
Unrealized gain (loss) on derivative instruments | $ 0.7 | $ 0.1
Russian rouble zero cost collars | 2018 |  |
Financial Instruments |  |
Financial assets | $ 24.0 |
Russian rouble zero cost collars | Put | 2018 |  |
Financial Instruments |  |
Average price | ₽ / $ | 60.0 |
Russian rouble zero cost collars | Call | 2018 |  |
Financial Instruments |  |
Average price | ₽ / $ | 71.2 |
Canadian dollar new forward contracts | From 2018 to 2019 |  |
Financial Instruments |  |
Financial assets | $ 58.5 |
Average price | $ / $ | 1.33 |
Russian rouble new forward contract | Put | 2018 |  |
Financial Instruments |  |
Financial assets | $ 24.0 |
Average price | ₽ / $ | 60.00 |
Russian rouble new forward contract | Call | 2018 |  |
Financial Instruments |  |
Average price | ₽ / $ | 71.24 |
Brazilian real new forward contract |  |
Financial Instruments |  |
Average price | R$ / $ | 3.32 |
Brazilian real new forward contract | 2018 |  |
Financial Instruments |  |
Financial assets | $ 69.6 |
Brazilian real new forward contract | 2019 |  |
Financial Instruments |  |
Financial assets | $ 60.0 |
Brazilian real new forward contract | Put | 2019 |  |
Financial Instruments |  |
Average price | R$ / $ | 3.45 |
Brazilian real new forward contract | Call | 2019 |  |
Financial Instruments |  |
Average price | R$ / $ | 3.64 |

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