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Quarterly report pursuant to Section 13 or 15(d)

DISCONTINUED OPERATIONS DISCONTINUED OPERATIONS (Narrative) (Details)

v3.2.0.727
DISCONTINUED OPERATIONS DISCONTINUED OPERATIONS (Narrative) (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Deconsolidation, Gain (Loss), Amount Ìý Ìý Ìý $ (528,200,000) Ìý Ìý
Canadian Entities [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Discontinued Operation, Tax Effect of Discontinued Operation $ 700,000 Ìý $ 36,200,000 700,000 $ 80,200,000 Ìý
Deconsolidation, Gain (Loss), Amount 134,700,000 Ìý 0 (684,000,000) 0 Ìý
Cost Method Investments 0 Ìý Ìý 0 Ìý Ìý
Contingent Liabilities of Deconsolidated Entities 139,100,000 Ìý Ìý Ìý Ìý Ìý
Wabush [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Debtor-in-Possession Financing, Amount Arranged 10,000,000 Ìý Ìý 10,000,000 Ìý Ìý
Debtor-in-Possession Financing, Borrowings Outstanding 1,400,000 Ìý Ìý 1,400,000 Ìý Ìý
Deconsolidation, Gain (Loss), Amount 134,700,000 Ìý Ìý Ìý Ìý Ìý
North American Coal [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Pension and Other Postretirement Defined Benefit Plans, Liabilities 330,000,000 Ìý Ìý 330,000,000 Ìý Ìý
Discontinued Operation, Tax Effect of Discontinued Operation 400,000 Ìý $ 40,500,000 500,000 $ 47,900,000 Ìý
Tangible Asset Impairment Charges Ìý $ (73,400,000) Ìý Ìý Ìý Ìý
Bloom Lake Group [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Deconsolidation, Gain (Loss), Amount Ìý Ìý Ìý 818,700,000 Ìý Ìý
Contingent Liabilities of Deconsolidated Entities Ìý Ìý Ìý (203,600,000) Ìý Ìý
Asia Pacific Iron Ore [Member] | Asia Pacific Iron Ore [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Tangible Asset Impairment Charges Ìý Ìý Ìý Ìý Ìý $ 526,500,000
Other Current Liabilities [Member] | Bloom Lake Group [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Contingent Liabilities recognized in Consolidated Financials 120,700,000 Ìý Ìý 120,700,000 Ìý Ìý
Other Liabilities [Member] | Bloom Lake Group [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Contingent Liabilities recognized in Consolidated Financials 39,800,000 Ìý Ìý 39,800,000 Ìý Ìý
Fair Value, Inputs, Level 3 [Member] | Other Current Assets [Member] | Canadian Entities [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Loans, Associated Interest and Accounts Receivable recognized in Consolidated Financials at Fair Value $ 94,500,000 Ìý Ìý $ 94,500,000 Ìý Ìý