Quarterly report pursuant to Section 13 or 15(d)

DISCONTINUED OPERATIONS (Schedule of Disposal Groups, Including Discontinued Operations) (Details)

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DISCONTINUED OPERATIONS (Schedule of Disposal Groups, Including Discontinued Operations) (Details)
$ in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2018
CAD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Income (loss) from discontinued operations, net of tax $ (0.9) $ 238.0   $ (1.5) $ 102.8
Net cash used by operating activities       388.1 188.7
Net cash provided by investing activities       (449.5) $ (173.7)
Noncash Investing and Financing Activities Related Text         For the nine months ended September 30, 2018, we had $27.1 million of non-cash financing activities related to the release of asset retirement obligations at Asia Pacific Iron Ore as part of the sale of substantially all remaining assets.
Gain on foreign currency translation   228.1   0.0 $ 228.1
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 (0.1) 242.3   (1.1) 117.6
Revenues from product sales and services 0.0 0.0   0.0 129.1
Cost of goods sold 0.0 (0.5)   0.0 (230.7)
Sales margin 0.0 (0.5)   0.0 (101.6)
Other operating expense 0.0 14.8   (0.8) (4.0)
Other expense (0.1) (0.1)   (0.3) (2.3)
Gain on foreign currency translation 0.0 228.1   0.0 228.1
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 (0.8) (4.3)   (0.4) (4.2)
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 $ 0.0   0.0 (10.6)
Cash Contribution     $ 19.0    
Discontinued Operations [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Net cash used by operating activities       (1.9) (91.6)
Net cash provided by investing activities       0.1 17.8
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       (1.9) (77.0)
Net cash provided by investing activities       0.1 17.8
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)