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DISCONTINUED OPERATIONS (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018
DISCONTINUED OPERATIONS |  |  |  |
Profit (loss) from discontinued operations | [1] |  | $ 0.0 | $ (154.9)
Net Cash Received From Disposal Of Mesquite Asset |  | $ 158.0 |  |
Discontinued operations [member] |  |  |  |
DISCONTINUED OPERATIONS |  |  |  |
Profit (loss) from discontinued operations |  |  |  | (154.1)
Peak Mines [Member] | Discontinued operations [member] |  |  |  |
DISCONTINUED OPERATIONS |  |  |  |
Profit (loss) from discontinued operations |  |  |  | $ 0.8
Mesquite [Member] |  |  |  |
DISCONTINUED OPERATIONS |  |  |  |
Disposal Costs Incurred |  | $ 0.9 |  |
[1] | In the prior year period, Peak Mines and Mesquite were classified as discontinued operations and accordingly earnings and cash flows from continuing operations are presented exclusive of Peak Mines and Mesquite. Peak Mines was sold in April 2018 and Mesquite was sold in October 2018. Refer to Note 16 for further details.

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