Annual report pursuant to Section 13 and 15(d)

DISCONTINUED OPERATIONS Schedule of Disposal Groups, including Discontinued Operations, Income Statement, Balance Sheet and Cash Flows (Details)

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DISCONTINUED OPERATIONS Schedule of Disposal Groups, including Discontinued Operations, Income Statement, Balance Sheet and Cash Flows (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
INCOME FROM DISCONTINUED OPERATIONS, net of tax $ 88.2 $ 2.5 $ 76.7  
Current assets of discontinued operations 12.4 118.5   $ 118.5
Non-current assets of discontinued operations 0.0 20.3   20.3
Current liabilities of discontinued operations 6.7 75.0   75.0
Non-current liabilities of discontinued operations 8.3 52.2   $ 52.2
Net cash provided (used) by operating activities 478.5 338.1 303.0  
Net cash provided (used) by investing activities (273.1) (156.0) (57.9)  
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 118.3 21.2 96.6  
Current assets of discontinued operations 12.4 118.5    
Non-current assets of discontinued operations 0.0 20.3    
Current liabilities of discontinued operations 3.8 71.8    
Non-current liabilities of discontinued operations 8.3 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 (3.6) 2.6 (2.4)  
Current assets of discontinued operations 0.0 0.0    
Non-current assets of discontinued operations 0.0 0.0    
Current liabilities of discontinued operations 2.9 3.2    
Non-current liabilities of discontinued operations 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 (26.5) (21.3) (17.5)  
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 (95.9) 79.6 99.8  
Net cash provided (used) by investing activities 19.8 (8.4) 10.0  
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 (81.3) 79.6 99.8  
Net cash provided (used) by investing activities 19.8 (2.8) (0.4)  
Discontinued Operations [Member] | North American Coal [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Net cash provided (used) by investing activities 0.0 2.1 3.6  
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 0.0  
Net cash provided (used) by investing activities $ 0.0 $ (7.7) $ 6.8