Quarterly report pursuant to Section 13 or 15(d)

DISCONTINUED OPERATIONS (Schedule of Disposal Groups, including Discontinued Operations, Income Statement) (Details)

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DISCONTINUED OPERATIONS (Schedule of Disposal Groups, including Discontinued Operations, Income Statement) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 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
Asia Pacific Iron Ore [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Revenues from product sales and services 0.0 101.7 129.1 375.1
Cost of goods sold and operating expenses 0.5 98.7 230.7 323.9
Sales margin (0.5) 3.0 (101.6) 51.2
Other operating income (expense) 14.8 (3.9) (4.0) (7.6)
Other expense (0.1) (1.3) (2.3) (4.0)
Income (loss) from discontinued operations before income taxes 14.2 (2.2) (107.9) 39.6
Impairment of long-lived assets 0.0 0.0 (2.6) 0.0
Income tax benefit (expense) 0.0 0.4 0.0 (0.4)
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX $ 242.3 $ (1.8) $ 117.6 $ 39.2