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EXPENSES (Details 2) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Other gains and losses [Abstract] |  |  |
Unrealized gain on share purchase warrants |  | $ 1.2 | $ 0.2
Gain on foreign exchange |  | 43.8 | 12.0
Gain on disposal of El Morro stream | $ 33.0 | 33.0 | 0.0
Other gain on disposal of assets |  | 0.3 | 0.1
(Loss) gain on revaluation of investments |  | (0.2) | 0.5
Unrealized loss on revaluation of gold stream obligation (Note 13) |  | (21.8) | (31.1)
Settlement and (loss) gain on revaluation of gold price option contracts |  | (13.9) | 10.5
Loss on revaluation of copper forward contracts and copper price option contracts |  | (4.4) | 0.3
Other |  | 1.2 | (0.2)
Total other gains (losses) |  | $ 39.2 | $ (7.7)

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