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DISCONTINUED OPERATIONS (Schedule of Disposal Groups, Including Discontinued Operations) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Income (loss) from discontinued operations, net of tax | $ (0.6) | $ (64.3) | $ (0.6) | $ (135.2)
Net cash used by operating activities |  |  | 151.1 | (49.3)
Net cash provided by investing activities |  |  | (292.4) | $ (99.8)
Noncash Investing and Financing Activities Related Text |  |  |  | For the six months ended June 30, 2018, we had $28.6 million of non-cash financing activities related to the settlement of capital lease obligations at Asia Pacific Iron Ore.
Asia Pacific Iron Ore [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Income (loss) from discontinued operations, net of tax | (0.5) | (53.3) | (1.0) | $ (124.7)
Revenues from product sales and services | 0.0 | 70.1 | 0.0 | 129.1
Cost of goods sold | 0.0 | 106.1 | 0.0 | 230.2
Sales margin | 0.0 | (36.0) | 0.0 | (101.1)
Other operating expense | 0.4 | 16.2 | 0.8 | 18.8
Other expense | 0.1 | 1.1 | 0.2 | 2.2
Impairment of long-lived assets | 0.0 | 0.0 | 0.0 | 2.6
North American Coal [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Income (loss) from discontinued operations, net of tax | (0.1) | (0.3) | 0.4 | 0.1
Canadian Entities [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Income (loss) from discontinued operations, net of tax | $ 0.0 | $ (10.7) | 0.0 | (10.6)
Discontinued Operations [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net cash used by operating activities |  |  | (1.5) | (46.3)
Net cash provided by investing activities |  |  | 0.1 | 14.1
Discontinued Operations [Member] | Asia Pacific Iron Ore [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net cash used by operating activities |  |  | (1.5) | (31.7)
Net cash provided by investing activities |  |  | 0.1 | 14.1
Discontinued Operations [Member] | Canadian Entities [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net cash used by operating activities |  |  | $ 0.0 | $ (14.6)

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