Quarterly report pursuant to Section 13 or 15(d)

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

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DISCONTINUED OPERATIONS (Disposal Groups, Including Discontinued Operations) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX $ (64.3) $ (53.7) $ (135.2) $ (5.0)    
Current assets of discontinued operations 45.3   45.3   $ 118.5 $ 118.5
Non-current assets of discontinued operations 0.0   0.0   20.3 20.3
Current liabilities of discontinued operations 117.3   117.3   75.0 75.0
NON-CURRENT LIABILITIES OF DISCONTINUED OPERATIONS 10.3   10.3   $ 52.2 52.2
Net cash provided (used) by operating activities     (49.3) 67.8    
Asia Pacific Iron Ore [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX (53.3) (7.3) (124.7) 41.0    
Current assets of discontinued operations 45.3   45.3     118.5
Non-current assets of discontinued operations 0.0   0.0     20.3
Current liabilities of discontinued operations 114.4   114.4     71.8
NON-CURRENT LIABILITIES OF DISCONTINUED OPERATIONS 10.3   10.3     52.2
North American Coal [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX (0.3) 2.6 0.1 2.6    
Current assets of discontinued operations 0.0   0.0     0.0
Non-current assets of discontinued operations 0.0   0.0     0.0
Current liabilities of discontinued operations 2.9   2.9     3.2
NON-CURRENT LIABILITIES OF DISCONTINUED OPERATIONS 0.0   0.0     $ 0.0
Canadian Entities [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX $ (10.7) $ (49.0) (10.6) (48.6)    
Discontinued Operations [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Net cash provided (used) by operating activities     (46.3) 92.2    
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 provided (used) by operating activities     (31.7) 92.2    
Non-cash financing activities     28.6      
Discontinued Operations [Member] | Canadian Entities [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Net cash provided (used) by operating activities     $ (14.6) $ 0.0