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DISCONTINUED OPERATIONS (Schedule of Disposal Groups, including Discontinued Operations, Income Statement) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent | $ 0.0 | $ (70.9)
Asia Pacific Iron Ore [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Revenues from product sales and services | 0.0 | 59.0
Cost of goods sold and operating expenses | 0.0 | 124.1
Sales margin | 0.0 | (65.1)
Other operating expense | (0.4) | (2.5)
Other expense | (0.1) | (1.1)
Impairment of long-lived assets | 0.0 | (2.6)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent | $ (0.5) | $ (71.3)

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- Definition Amount of costs of goods sold attributable to disposal group, including, but not limited to, discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 + Details
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- Definition Amount of gross profit attributable to disposal group, including, but not limited to, discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 + Details
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