ÈÕº«Èý¼¶Æ¬

Annual report pursuant to Section 13 and 15(d)

DISCONTINUED OPERATIONS SCHEDULE OF DISPOSAL GROUPS (Details)

v2.4.1.9
DISCONTINUED OPERATIONS SCHEDULE OF DISPOSAL GROUPS (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued ÈÕº«Èý¼¶Æ¬ [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Income (Loss) from Continuing ÈÕº«Èý¼¶Æ¬ before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Ìý Ìý Ìý Ìý Ìý Ìý $ (9,603.7)us-gaap_IncomeLossFromContinuingÈÕº«Èý¼¶Æ¬BeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 489.3us-gaap_IncomeLossFromContinuingÈÕº«Èý¼¶Æ¬BeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ (501.8)us-gaap_IncomeLossFromContinuingÈÕº«Èý¼¶Æ¬BeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
INCOME and GAIN ON SALE FROM DISCONTINUED OPERATIONS, net of tax 0us-gaap_IncomeLossFromDiscontinuedÈÕº«Èý¼¶Æ¬NetOfTax 0us-gaap_IncomeLossFromDiscontinuedÈÕº«Èý¼¶Æ¬NetOfTax 0us-gaap_IncomeLossFromDiscontinuedÈÕº«Èý¼¶Æ¬NetOfTax 2.0us-gaap_IncomeLossFromDiscontinuedÈÕº«Èý¼¶Æ¬NetOfTax 0us-gaap_IncomeLossFromDiscontinuedÈÕº«Èý¼¶Æ¬NetOfTax 0us-gaap_IncomeLossFromDiscontinuedÈÕº«Èý¼¶Æ¬NetOfTax 0us-gaap_IncomeLossFromDiscontinuedÈÕº«Èý¼¶Æ¬NetOfTax 2.0us-gaap_IncomeLossFromDiscontinuedÈÕº«Èý¼¶Æ¬NetOfTax 35.9us-gaap_IncomeLossFromDiscontinuedÈÕº«Èý¼¶Æ¬NetOfTax
Sonoma [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued ÈÕº«Èý¼¶Æ¬ [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Disposal Group, Including Discontinued Operation, Revenue Ìý Ìý Ìý Ìý Ìý Ìý 0us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedÈÕº«Èý¼¶Æ¬Axis
= clf_SonomaMember
0us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedÈÕº«Èý¼¶Æ¬Axis
= clf_SonomaMember
151.6us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedÈÕº«Èý¼¶Æ¬Axis
= clf_SonomaMember
INCOME and GAIN ON SALE FROM DISCONTINUED OPERATIONS, net of tax 0us-gaap_IncomeLossFromDiscontinuedÈÕº«Èý¼¶Æ¬NetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedÈÕº«Èý¼¶Æ¬Axis
= clf_SonomaMember
Ìý Ìý Ìý Ìý Ìý 0us-gaap_IncomeLossFromDiscontinuedÈÕº«Èý¼¶Æ¬NetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedÈÕº«Èý¼¶Æ¬Axis
= clf_SonomaMember
2.0us-gaap_IncomeLossFromDiscontinuedÈÕº«Èý¼¶Æ¬NetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedÈÕº«Èý¼¶Æ¬Axis
= clf_SonomaMember
35.9us-gaap_IncomeLossFromDiscontinuedÈÕº«Èý¼¶Æ¬NetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedÈÕº«Èý¼¶Æ¬Axis
= clf_SonomaMember
Income (Loss) From Discontinued ÈÕº«Èý¼¶Æ¬ [Member] | Sonoma [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued ÈÕº«Èý¼¶Æ¬ [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Ìý Ìý Ìý Ìý Ìý Ìý 0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedÈÕº«Èý¼¶Æ¬Axis
= clf_SonomaMember
/ us-gaap_IncomeStatementLocationAxis
= clf_IncomeLossFromDiscontinuedÈÕº«Èý¼¶Æ¬Member
0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedÈÕº«Èý¼¶Æ¬Axis
= clf_SonomaMember
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= clf_IncomeLossFromDiscontinuedÈÕº«Èý¼¶Æ¬Member
38.0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedÈÕº«Èý¼¶Æ¬Axis
= clf_SonomaMember
/ us-gaap_IncomeStatementLocationAxis
= clf_IncomeLossFromDiscontinuedÈÕº«Èý¼¶Æ¬Member
INCOME and GAIN ON SALE FROM DISCONTINUED OPERATIONS, net of tax Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý (2.1)us-gaap_IncomeLossFromDiscontinuedÈÕº«Èý¼¶Æ¬NetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedÈÕº«Èý¼¶Æ¬Axis
= clf_SonomaMember
/ us-gaap_IncomeStatementLocationAxis
= clf_IncomeLossFromDiscontinuedÈÕº«Èý¼¶Æ¬Member
Wabush [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued ÈÕº«Èý¼¶Æ¬ [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Income (Loss) from Continuing ÈÕº«Èý¼¶Æ¬ before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Ìý Ìý Ìý Ìý Ìý Ìý (345.6)us-gaap_IncomeLossFromContinuingÈÕº«Èý¼¶Æ¬BeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ clf_ReportingUnitAxis
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(258.6)us-gaap_IncomeLossFromContinuingÈÕº«Èý¼¶Æ¬BeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ clf_ReportingUnitAxis
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(131.8)us-gaap_IncomeLossFromContinuingÈÕº«Èý¼¶Æ¬BeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ clf_ReportingUnitAxis
= clf_WabushMember
CLCC [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued ÈÕº«Èý¼¶Æ¬ [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Income (Loss) from Continuing ÈÕº«Èý¼¶Æ¬ before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Ìý Ìý Ìý Ìý Ìý Ìý $ (669.9)us-gaap_IncomeLossFromContinuingÈÕº«Èý¼¶Æ¬BeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ clf_ReportingUnitAxis
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$ (55.0)us-gaap_IncomeLossFromContinuingÈÕº«Èý¼¶Æ¬BeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ clf_ReportingUnitAxis
= clf_ClccMember
$ (41.8)us-gaap_IncomeLossFromContinuingÈÕº«Èý¼¶Æ¬BeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ clf_ReportingUnitAxis
= clf_ClccMember