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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
LOSS FROM DISCONTINUED OPERATIONS, net of tax | $ (19.9) | $ (892.1) | $ (8,368.0)
Income (Loss) from Discontinued Operations, net of tax, including portion attributable to Noncontrolling interest, Canadian Entities and North American Coal |  |  | (8,368.0)
Short-term assets of discontinued operations |  | 14.9 |
Short-term liabilities of discontinued operations | 6.0 | 6.9 |
Depreciation, depletion and amortization | 115.4 | 134.0 | 504.0
Payments to Acquire Property, Plant, and Equipment | 69.1 | 80.8 | 284.1
Impairment of goodwill and other long-lived assets | 0.0 | 76.6 | 9,029.9
North American Coal [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
LOSS FROM DISCONTINUED OPERATIONS, net of tax | (2.4) | (152.4) | (1,134.5)
Short-term assets of discontinued operations |  | 14.9 |
Short-term liabilities of discontinued operations | 6.0 | 6.9 |
Depreciation, depletion and amortization |  | 3.2 | 106.9
Payments to Acquire Property, Plant, and Equipment |  | 15.9 | 29.9
Impairment of goodwill and other long-lived assets |  | 73.4 | 857.5
Eastern Canadian Iron Ore [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
LOSS FROM DISCONTINUED OPERATIONS, net of tax | (17.5) | (638.7) | (6,952.9)
Short-term assets of discontinued operations |  | 0.0 |
Short-term liabilities of discontinued operations | 0.0 | 0.0 |
Depreciation, depletion and amortization |  | 0.0 | 135.6
Payments to Acquire Property, Plant, and Equipment |  | 0.0 | 190.3
Impairment of goodwill and other long-lived assets |  | 0.0 | 7,269.2
Other Canadian Operations [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
LOSS FROM DISCONTINUED OPERATIONS, net of tax | 0.0 | (101.0) | (280.6)
Short-term assets of discontinued operations |  | 0.0 |
Short-term liabilities of discontinued operations | 0.0 | 0.0 |
Depreciation, depletion and amortization |  | 0.0 | 0.5
Payments to Acquire Property, Plant, and Equipment |  | 0.0 | 0.0
Impairment of goodwill and other long-lived assets |  | 0.0 | 267.6
Canadian Entities [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
LOSS FROM DISCONTINUED OPERATIONS, net of tax | (17.5) | (739.7) | (7,233.5)
Short-term assets of discontinued operations |  | 0.0 |
Short-term liabilities of discontinued operations | $ 0.0 | 0.0 |
Depreciation, depletion and amortization |  | 0.0 | 136.1
Payments to Acquire Property, Plant, and Equipment |  | 0.0 | 190.3
Impairment of goodwill and other long-lived assets |  | 0.0 | 7,536.8
Discontinued Operations [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Depreciation, depletion and amortization |  | 3.2 | 243.0
Payments to Acquire Property, Plant, and Equipment |  | 15.9 | 220.2
Impairment of goodwill and other long-lived assets |  | $ 73.4 | $ 8,394.3

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