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INCOME AND MINING TAXES (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Income and mining taxes [Line Items] |  |  |
Adjustments for current tax of prior periods |  | $ 0.1 | $ (4.6)
Current tax expense (income) and adjustments for current tax of prior periods |  | 15.1 | 8.7
Adjustments for deferred tax of prior periods |  | (1.3) | 5.9
Deferred tax expense (income) | $ 1.9 | (131.0) | (10.8)
Total income tax recovery |  | (115.9) | (2.1)
Canada [Member] |  |  |
Income and mining taxes [Line Items] |  |  |
Current tax expense (income) |  | 2.8 | (1.8)
Deferred tax expense (income) |  | (87.7) | 1.4
Foreign [Member] |  |  |
Income and mining taxes [Line Items] |  |  |
Current tax expense (income) |  | 12.2 | 15.1
Deferred tax expense (income) |  | $ (42.0) | $ (18.1)

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