Quarterly report pursuant to Section 13 or 15(d)

DISCONTINUED OPERATIONS (Schedule of Disposal Groups, including Discontinued Operations, Assets and Liabilities) (Details)

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DISCONTINUED OPERATIONS (Schedule of Disposal Groups, including Discontinued Operations, Assets and Liabilities) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Current assets of discontinued operations $ 45.3 $ 118.5 $ 118.5
Current liabilities of discontinued operations 117.3 $ 75.0 75.0
Asia Pacific Iron Ore [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Cash and cash equivalents 29.4   29.4
Accounts receivable, net 12.5   33.9
Inventories 0.0   45.0
Supplies and other inventories 0.0   5.1
Other current assets 3.4   5.1
Current assets of discontinued operations 45.3   118.5
Property, plant and equipment, net 0.0   17.2
Other non-current assets 0.0   3.1
Total assets of discontinued operations 45.3   138.8
Accounts payable 74.3   28.2
Accrued liabilities 21.1   28.0
Other current liabilities 19.0   15.6
Current liabilities of discontinued operations 114.4   71.8
Environmental and mine closure obligations 10.3   28.8
Other liabilities 0.0   23.4
Total liabilities of discontinued operations $ 124.7   $ 124.0