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GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Schedule Of Finite-Lived Intangible Assets By Major Class) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Finite-Lived Intangible Assets [Line Items] |  |
Definite lived intangible assets - Gross Carrying Amount | $ 79.2 us-gaap_FiniteLivedIntangibleAssetsGross | $ 184.5 us-gaap_FiniteLivedIntangibleAssetsGross
Definite lived intangible assets - Accumulated Amortization | (16.5)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (89.1)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Definite lived intangible assets - Net Carrying Amount | 62.7 us-gaap_FiniteLivedIntangibleAssetsNet | 95.4 us-gaap_FiniteLivedIntangibleAssetsNet
Permits [Member] | Other Assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Definite lived intangible assets - Gross Carrying Amount | 79.2 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UseRightsMember | 127.4 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UseRightsMember
Definite lived intangible assets - Accumulated Amortization | (16.5)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UseRightsMember | (35.9)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UseRightsMember
Definite lived intangible assets - Net Carrying Amount | 62.7 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UseRightsMember | 91.5 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UseRightsMember
Utility Contracts [Member] | Other Assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Definite lived intangible assets - Gross Carrying Amount |  | 54.7 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = clf_UtilityContractsMember
Definite lived intangible assets - Accumulated Amortization |  | (53.1)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = clf_UtilityContractsMember
Definite lived intangible assets - Net Carrying Amount |  | 1.6 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = clf_UtilityContractsMember
Leases [Member] | Other Assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Definite lived intangible assets - Gross Carrying Amount |  | 2.4 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeaseAgreementsMember
Definite lived intangible assets - Accumulated Amortization |  | (0.1)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeaseAgreementsMember
Definite lived intangible assets - Net Carrying Amount |  | 2.3 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeaseAgreementsMember
Below Market Sales Contracts [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Definite lived intangible assets - Gross Carrying Amount | (228.9)us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = clf_BelowMarketSalesContractsMember | (228.9)us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = clf_BelowMarketSalesContractsMember
Definite lived intangible assets - Accumulated Amortization | 182.8 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = clf_BelowMarketSalesContractsMember | 159.7 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = clf_BelowMarketSalesContractsMember
Definite lived intangible assets - Net Carrying Amount | (46.1)us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = clf_BelowMarketSalesContractsMember | (69.2)us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = clf_BelowMarketSalesContractsMember
Below Market Sales Contracts [Member] | Other Current Liabilities [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Definite lived intangible assets - Gross Carrying Amount | (23.0)us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = clf_BelowMarketSalesContractsMember | (23.0)us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = clf_BelowMarketSalesContractsMember
Definite lived intangible assets - Net Carrying Amount | (23.0)us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = clf_BelowMarketSalesContractsMember | (23.0)us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = clf_BelowMarketSalesContractsMember
Below Market Sales Contracts [Member] | Other Liabilities [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Definite lived intangible assets - Gross Carrying Amount | (205.9)us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = clf_BelowMarketSalesContractsMember | (205.9)us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = clf_BelowMarketSalesContractsMember
Definite lived intangible assets - Accumulated Amortization | 182.8 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = clf_BelowMarketSalesContractsMember | 159.7 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = clf_BelowMarketSalesContractsMember
Definite lived intangible assets - Net Carrying Amount | $ (23.1)us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = clf_BelowMarketSalesContractsMember | $ (46.2)us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = clf_BelowMarketSalesContractsMember

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