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