Annual report pursuant to Section 13 and 15(d)

DISCONTINUED OPERATIONS (Narrative) (Details)

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DISCONTINUED OPERATIONS (Narrative) (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income (loss) from discontinued operations, net of tax $ (1.7) $ 88.2   $ 2.5
Canadian Entities [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Loans to and accounts receivables from the Canadian Entities   51.6    
Income tax benefit (expense) 0.0 15.9   0.0
Cash Contribution     $ 19.0  
Contingent claims   (55.6)    
Income (loss) from discontinued operations, net of tax 0.3 (26.5)   (21.3)
Asia Pacific Iron Ore [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain on foreign currency translation 0.0 228.1   0.0
Income (loss) from discontinued operations, net of tax $ (1.5) $ 118.3   21.2
Wabush Scully Mine Sale [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income (loss) from discontinued operations, net of tax       $ 31.4