XML 147 R125.htm IDEA: XBRL DOCUMENT
v3.6.0.2

DISCONTINUED OPERATIONS Schedule of Disposal Groups, including Discontinued Operations, Assets and Liabilities - Canadian Entities (Details) CAD in Thousands, $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Jun. 30, 2016 CAD | Mar. 31, 2016 CAD
Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Line Items] |  |  |  |  |  |
Deconsolidation, Gain (Loss), Amount |  |  | $ (528.2) |  |  |
Sale amount for Pointe Noire port and rail assets | CAD |  |  |  |  |  | CAD 66,750
Sale Amount of the Bloom Lake Mine and Labrador Trough South mineral claims | CAD |  |  |  |  | CAD 10,500 |
Canadian Entities [Member] |  |  |  |  |  |
Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Line Items] |  |  |  |  |  |
Deconsolidation, Gain (Loss), Amount |  | $ (17.5) | (710.9) | $ 0.0 |  |
Wabush [Member] |  |  |  |  |  |
Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Line Items] |  |  |  |  |  |
Debtor-in-Possession Financing, Borrowings Outstanding |  | 0.0 |  |  |  |
Bloom Lake Group [Member] |  |  |  |  |  |
Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Line Items] |  |  |  |  |  |
Deconsolidation, Gain (Loss), Amount | $ 818.7 |  |  |  |  |
Other Current Assets [Member] | Canadian Entities [Member] |  |  |  |  |  |
Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Line Items] |  |  |  |  |  |
Debtor-in-Possession Financing, Borrowings Outstanding |  | 1.5 |  |  |  |
Debtor-in-possession,Repayment |  | 8.3 |  |  |  |
Other Current Assets [Member] | Fair Value, Inputs, Level 3 [Member] | Canadian Entities [Member] |  |  |  |  |  |
Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Line Items] |  |  |  |  |  |
Loans, Associated Interest and Accounts Receivable recognized in Consolidated Financials at Fair Value |  | 48.6 | 72.9 |  |  |
Other Current Liabilities [Member] | Bloom Lake Group [Member] |  |  |  |  |  |
Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Line Items] |  |  |  |  |  |
Contingent Liabilities recognized in Consolidated Financials |  | 37.0 | 35.9 |  |  |
Guarantees [Member] | Bloom Lake Group [Member] |  |  |  |  |  |
Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Line Items] |  |  |  |  |  |
Contingent Liabilities recognized in Consolidated Financials |  | $ 0.2 | $ 96.5 |  |  |

X
- Definition Contingent Liabilities recognized in Consolidated Financials + References No definition available. + Details
Name: | clf_ContingentLiabilitiesrecognizedinConsolidatedFinancials
Namespace Prefix: | clf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debtor-in-possession, Repayment + References No definition available. + Details
Name: | clf_DebtorinpossessionRepayment
Namespace Prefix: | clf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans, Associated Interest and Accounts Receivable recognized in Consolidated Financials at Fair Value + References No definition available. + Details
Name: | clf_LoansAssociatedInterestandAccountsReceivablerecognizedinConsolidatedFinancialsatFairValue
Namespace Prefix: | clf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Sale Amount of the Bloom Lake Mine and Labrador Trough South mineral claims + References No definition available. + Details
Name: | clf_SaleAmountoftheBloomLakeMineandLabradorTroughSouthmineralclaims
Namespace Prefix: | clf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Sale amount of port and rail assets located in Pointe-Noire, Quebec in cash and the assumption of certain liabilities + References No definition available. + Details
Name: | clf_SaleamountforPointeNoireportandrailassets
Namespace Prefix: | clf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition [Line Items] for Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Table] + References No definition available. + Details
Name: | clf_ScheduleofDisposalGroupsIncludingDiscontinuedOperationsAssetsandLiabilitiesLineItems
Namespace Prefix: | clf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of debtor-in-possession borrowings outstanding. + References No definition available. + Details
Name: | us-gaap_DebtorInPossessionFinancingBorrowingsOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of the gain (loss) recognized by the parent and included in its attributable portion of net income for the period due to deconsolidation of a subsidiary or derecognition of a group of assets. The gain (loss) recognized and included in the net income attributable to the parent for the period is generally computed as the difference between: (a) the aggregate of: (1) the fair value of any consideration received; (2) the fair value of any retained noncontrolling investment in the former subsidiary at the date the subsidiary was deconsolidated; and (3) the carrying amount of any noncontrolling interest in the former subsidiary (including any accumulated other comprehensive income attributable to the noncontrolling interest) at the date the subsidiary was deconsolidated and (b) the carrying amount of the former subsidiary's assets and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=64809438&loc=SL4582445-111684 + Details
Name: | us-gaap_DeconsolidationGainOrLossAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=clf_CanadianEntitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=clf_WabushMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=clf_BloomLakeGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherCurrentAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherCurrentLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_GuaranteesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |