AG真人平台AG真人试玩

Annual report pursuant to Section 13 and 15(d)

RELATED PARTIES (Summary Of Other Ownership Interests) (Details)

v2.4.1.9
RELATED PARTIES (Summary Of Other Ownership Interests) (Details)
Dec. 31, 2014
Dec. 31, 2012
Hibbing [Member] | Arcelor Mittal [Member] 听 听
Related Party Transaction [Line Items] 听 听
Ownership interest, equity method investment 62.30%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= clf_ArcelorMittalMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= clf_HibbingMember 		听
Hibbing [Member] | WISCO [Member] 听 听
Related Party Transaction [Line Items] 听 听
Ownership interest, equity method investment 0.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= clf_WiscoMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= clf_HibbingMember 		听
Hibbing [Member] | U. S. AG真人平台AG真人试玩 Canada [Member] 听 听
Related Party Transaction [Line Items] 听 听
Ownership interest, equity method investment 14.70%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= clf_USAG真人平台AG真人试玩CanadaMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= clf_HibbingMember 		听
Empire [Member] 听 听
Related Party Transaction [Line Items] 听 听
Noncontrolling Interest, Ownership Percentage by Parent 79.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ clf_NameofOperationAxis
= clf_EmpireMember 		听
Empire [Member] | Arcelor Mittal [Member] 听 听
Related Party Transaction [Line Items] 听 听
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 21.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ clf_NameofOperationAxis
= clf_EmpireMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= clf_ArcelorMittalMember 		听
Empire [Member] | WISCO [Member] 听 听
Related Party Transaction [Line Items] 听 听
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 0.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ clf_NameofOperationAxis
= clf_EmpireMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= clf_WiscoMember 		听
Empire [Member] | U. S. AG真人平台AG真人试玩 Canada [Member] 听 听
Related Party Transaction [Line Items] 听 听
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 0.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ clf_NameofOperationAxis
= clf_EmpireMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= clf_USAG真人平台AG真人试玩CanadaMember 		听
Tilden [Member] 听 听
Related Party Transaction [Line Items] 听 听
Noncontrolling Interest, Ownership Percentage by Parent 85.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ clf_NameofOperationAxis
= clf_TildenMember 		听
Tilden [Member] | Arcelor Mittal [Member] 听 听
Related Party Transaction [Line Items] 听 听
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 0.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ clf_NameofOperationAxis
= clf_TildenMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= clf_ArcelorMittalMember 		听
Tilden [Member] | WISCO [Member] 听 听
Related Party Transaction [Line Items] 听 听
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 0.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ clf_NameofOperationAxis
= clf_TildenMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= clf_WiscoMember 		听
Tilden [Member] | U. S. AG真人平台AG真人试玩 Canada [Member] 听 听
Related Party Transaction [Line Items] 听 听
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 15.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ clf_NameofOperationAxis
= clf_TildenMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= clf_USAG真人平台AG真人试玩CanadaMember 		听
Bloom Lake [Member] 听 听
Related Party Transaction [Line Items] 听 听
Noncontrolling Interest, Ownership Percentage by Parent 82.80%us-gaap_MinorityInterestOwnershipPercentageByParent
/ clf_NameofOperationAxis
= clf_BloomLakeMember 		75.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ clf_NameofOperationAxis
= clf_BloomLakeMember
Bloom Lake [Member] | Arcelor Mittal [Member] 听 听
Related Party Transaction [Line Items] 听 听
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 0.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ clf_NameofOperationAxis
= clf_BloomLakeMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= clf_ArcelorMittalMember 		听
Bloom Lake [Member] | WISCO [Member] 听 听
Related Party Transaction [Line Items] 听 听
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 17.20%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ clf_NameofOperationAxis
= clf_BloomLakeMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= clf_WiscoMember 		听
Bloom Lake [Member] | U. S. AG真人平台AG真人试玩 Canada [Member] 听 听
Related Party Transaction [Line Items] 听 听
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 0.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ clf_NameofOperationAxis
= clf_BloomLakeMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= clf_USAG真人平台AG真人试玩CanadaMember 		听
Investments in Ventures [Member] | Hibbing [Member] 听 听
Related Party Transaction [Line Items] 听 听
Ownership interest, equity method investment 23.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BalanceSheetLocationAxis
= clf_InvestmentsinVenturesMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= clf_HibbingMember 		[1] 听
[1] 1 At December 31, 2013, the classification for Hibbing was Other liabilities.