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SEGMENT REPORTING SEGMENT REPORTING (Schedule of Segment Reporting Information) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Amortization of Intangible Assets | $ 0.2 | $ 0.2 | $ 0.4 | $ 0.4
NET INCOME | 165.1 | 30.1 | 80.8 | 0.3
Revenues | 714.3 | 471.3 | 894.3 | 757.5
Gross Profit | 284.5 | 144.7 | 346.0 | 193.7
Other operating expense | (30.3) | (29.5) | (61.5) | (45.1)
Nonoperating Income (Expense) | (26.6) | (32.5) | (54.6) | (143.3)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | 227.6 | 82.7 | 229.9 | 5.3
Interest expense, net | (31.2) | (30.1) | (63.6) | (71.5)
Income Tax Expense (Benefit) | (1.8) | (1.1) | 13.9 | 0.0
Depreciation, depletion and amortization |  |  | (49.4) | (44.8)
EBITDA | 221.1 | 85.7 | 209.9 | 120.1
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX | (64.3) | (53.7) | (135.2) | (5.0)
Foreign currency transaction gain (loss), before tax | (0.1) | 0.5 | (0.5) | 15.3
Gain (loss) on extinguishment of debt | 0.2 | (4.9) | 0.2 | (76.8)
Adjusted EBITDA | 275.7 | 135.5 | 328.0 | 175.1
Property, Plant and Equipment, Additions | 70.4 | 24.6 | 149.3 | 51.7
Payments To Acquire Property Plant And Equipment Net |  |  | (114.4) | (48.5)
Payments to Acquire Property, Plant, and Equipment |  |  | 72.3 | 5.1
Capital Expenditures Incurred but Not yet Paid |  |  | 34.9 | 3.2
U.S. Iron Ore [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 714.3 | $ 471.3 | $ 894.3 | $ 757.5
Percentage Of Segment Revenue | 100.00% | 100.00% | 100.00% | 100.00%
Gross Profit | $ 284.5 | $ 144.7 | $ 346.0 | $ 193.7
Depreciation, depletion and amortization | (15.6) | (16.7) | (31.4) | (33.1)
EBITDA | 296.0 | 155.0 | 368.5 | 212.9
Adjusted EBITDA | 301.3 | 161.5 | 378.4 | 225.6
Property, Plant and Equipment, Additions | 26.7 | 24.6 | 45.4 | 51.7
All Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation, depletion and amortization | (17.0) | (18.3) | (34.2) | (36.8)
EBITDA | (74.9) | (69.3) | (158.6) | (92.8)
Adjusted EBITDA | (25.6) | (26.0) | (50.4) | (50.5)
Corporate and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation, depletion and amortization | (1.4) | (1.6) | (2.8) | (3.7)
Property, Plant and Equipment, Additions | 43.7 | 0.0 | 103.9 | 0.0
EBITDA Calculation [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Interest expense, net | (32.3) | (31.4) | (65.8) | (74.2)
Income Tax Expense (Benefit) | 1.8 | (2.6) | (13.9) | (0.8)
Depreciation, depletion and amortization | (25.5) | (21.6) | (49.4) | (44.8)
Adjusted EBITDA Calculation [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX | $ (54.7) | $ (45.4) | $ (117.8) | $ 6.5

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