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FINANCIAL RISK MANAGEMENT (Details 4) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Canadian dollar |  |
Disclosure of detailed information about financial instruments [line items] |  |
Impact of 10% change in foreign exchange rates | $ 24.6 | $ 20.5
Australian dollar |  |
Disclosure of detailed information about financial instruments [line items] |  |
Impact of 10% change in foreign exchange rates | (0.6) | 4.6
Mexican peso |  |
Disclosure of detailed information about financial instruments [line items] |  |
Impact of 10% change in foreign exchange rates | $ 1.1 | $ 1.8

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