XML 68 R109.htm IDEA: XBRL DOCUMENT
v2.4.1.9

INCOME TAXES INCOME TAXES (Income Taxes for Other than Continuing Operations) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Contingency [Line Items] |  |  |
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax | $ 39.8 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax | $ 100.0 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax | $ 13.8 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
Other Comprehensive Income Unrealized Gain Loss On Mark To Market Adjustments Arising During Period Tax | 3.6 clf_OtherComprehensiveIncomeUnrealizedGainLossOnMarkToMarketAdjustmentsArisingDuringPeriodTax | 2.0 clf_OtherComprehensiveIncomeUnrealizedGainLossOnMarkToMarketAdjustmentsArisingDuringPeriodTax | 1.7 clf_OtherComprehensiveIncomeUnrealizedGainLossOnMarkToMarketAdjustmentsArisingDuringPeriodTax
Other Comprehensive Income (Loss), Other Tax | (1.1)clf_OtherComprehensiveIncomeLossOtherTax | (12.4)clf_OtherComprehensiveIncomeLossOtherTax | 2.6 clf_OtherComprehensiveIncomeLossOtherTax
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | 42.3 us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 | 89.6 us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 | 18.1 us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
Income Tax Effects Allocated Directly To Equity, Equity Transactions, Acquisition of Noncontrolling Interest | 0 clf_IncomeTaxEffectsAllocatedDirectlyToEquityEquityTransactionsAcquisitionofNoncontrollingInterest | 102.1 clf_IncomeTaxEffectsAllocatedDirectlyToEquityEquityTransactionsAcquisitionofNoncontrollingInterest | 0 clf_IncomeTaxEffectsAllocatedDirectlyToEquityEquityTransactionsAcquisitionofNoncontrollingInterest
Income Tax Effects Allocated Directly to Equity, Equity Transactions | (4.8)us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityEquityTransactions | 3.5 us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityEquityTransactions | (12.8)us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityEquityTransactions
Income Tax Refunds, Discontinued Operations | $ 0 us-gaap_IncomeTaxRefundsDiscontinuedOperations | $ (2.0)us-gaap_IncomeTaxRefundsDiscontinuedOperations | $ 10.4 us-gaap_IncomeTaxRefundsDiscontinuedOperations

X
- Definition Income Tax Effects Allocated Directly To Equity, Equity Transactions, Acquisition of Noncontrolling Interest + References No definition available. + Details
Name: | clf_IncomeTaxEffectsAllocatedDirectlyToEquityEquityTransactionsAcquisitionofNoncontrollingInterest
Namespace Prefix: | clf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Other Comprehensive Income (Loss), Other Tax + References No definition available. + Details
Name: | clf_OtherComprehensiveIncomeLossOtherTax
Namespace Prefix: | clf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Tax effect on the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's increase (decrease) in deferred hedging gains or losses + References No definition available. + Details
Name: | clf_OtherComprehensiveIncomeUnrealizedGainLossOnMarkToMarketAdjustmentsArisingDuringPeriodTax
Namespace Prefix: | clf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeTaxContingencyLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The tax effect of an increase or decrease in contributed capital (for example, deductible expenditures reported as a reduction of the proceeds from issuing capital stock) during the period charged or credited directly to shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=18498875&loc=d3e39076-109324 + Details
Name: | us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityEquityTransactions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of cash received during the period as refunds for the overpayment of taxes from discontinued operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 + Details
Name: | us-gaap_IncomeTaxRefundsDiscontinuedOperations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of tax (expense) benefit, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of tax expense (benefit) allocated to other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569643-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration