XML 94 R84.htm IDEA: XBRL DOCUMENT
v3.3.0.814

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Statements Of Financial Performance Location Table) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) | $ 0.1 |  | $ (20.0) | $ (6.5) | $ (12.6)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (4.4) |  | 0.6 | (18.5) | (18.8)
Australian Dollar Foreign Exchange Contract Hedge Designation [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) | 0.1 |  | (12.6) | (2.0) | (3.4)
Australian Dollar Foreign Exchange Contract Hedge Designation [Member] | Product Revenues [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (0.1) | $ (6.3) | 1.6 | (7.4) | (11.2)
Australian Dollar Foreign Exchange Contracts Hedge Prior to De Designation [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) | 0.0 |  | 0.0 | (4.5) | 0.0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (4.3) |  | 0.0 | (11.1) | 0.0
Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) | 0.0 |  | (7.4) | 0.0 | (9.2)
Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member] | Cost of Sales [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | $ 0.0 |  | $ (1.0) | 0.0 | (7.1)
Canadian Dollar Foreign Exchange Contracts Hedge Prior to De Designation [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) |  |  |  | 0.0 | 0.0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  |  |  | $ 0.0 | $ (0.5)

X
- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624177-113959 + Details
Name: | us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
Name: | us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=clf_AustralianDollarForeignExchangeContractHedgeDesignationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_SalesRevenueGoodsNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=clf_AustralianDollarForeignExchangeContractsHedgePriortoDeDesignationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=clf_CanadianDollarForeignExchangeContractsHedgeDesignationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_CostOfSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=clf_CanadianDollarForeignExchangeContractsHedgePriortoDeDesignationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |