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) - 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)