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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX $ 238.0 $ 30.6 $ 102.8 $ 25.6    
Current assets of discontinued operations 16.1   16.1   $ 118.5 $ 118.5
Non-current assets of discontinued operations 0.0   0.0   20.3 20.3
Current liabilities of discontinued operations 14.2   14.2   75.0 75.0
NON-CURRENT LIABILITIES OF DISCONTINUED OPERATIONS 9.3   9.3   $ 52.2 52.2
Net cash provided (used) by operating activities     188.7 206.7    
Net cash used by investing activities     (173.7) (84.4)    
Asia Pacific Iron Ore [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX 242.3 (1.8) 117.6 39.2    
Current assets of discontinued operations 16.1   16.1     118.5
Non-current assets of discontinued operations 0.0   0.0     20.3
Current liabilities of discontinued operations 7.2   7.2     71.8
NON-CURRENT LIABILITIES OF DISCONTINUED OPERATIONS 9.3   9.3     52.2
North American Coal [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX (4.3) (0.7) (4.2) 1.9    
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 7.0   7.0     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]            
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX $ 0.0 $ 33.1 (10.6) (15.5)    
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     (91.6) 78.5    
Net cash used by investing activities     17.8 (1.5)    
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     (77.0) 78.5    
Non-cash financing activities     27.1      
Net cash used by investing activities     17.8 (1.5)    
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