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DISCONTINUED OPERATIONS (Narrative) (Details) $ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Income (loss) from discontinued operations, net of tax | $ (1.7) | $ 88.2 |  | $ 2.5
Canadian Entities [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Loans to and accounts receivables from the Canadian Entities |  | 51.6 |  |
Income tax benefit (expense) | 0.0 | 15.9 |  | 0.0
Cash Contribution |  |  | $ 19.0 |
Contingent claims |  | (55.6) |  |
Income (loss) from discontinued operations, net of tax | 0.3 | (26.5) |  | (21.3)
Asia Pacific Iron Ore [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain on foreign currency translation | 0.0 | 228.1 |  | 0.0
Income (loss) from discontinued operations, net of tax | $ (1.5) | $ 118.3 |  | 21.2
Wabush Scully Mine Sale [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Income (loss) from discontinued operations, net of tax |  |  |  | $ 31.4

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