GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Schedule Of Finite-Lived Intangible Assets By Major Class) (Details) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2015
|
Dec. 31, 2014
|
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Finite-Lived Intangible Assets [Line Items] | Ìý | Ìý |
Definite lived intangible assets - Gross Carrying Amount | $ 78.7us-gaap_FiniteLivedIntangibleAssetsGross | $ 79.2us-gaap_FiniteLivedIntangibleAssetsGross |
Definite lived intangible assets - Accumulated Amortization | (17.5)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (16.5)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Definite lived intangible assets - Net Carrying Amount | 61.2us-gaap_FiniteLivedIntangibleAssetsNet | 62.7us-gaap_FiniteLivedIntangibleAssetsNet |
Permits [Member] | Other Assets [Member] | Ìý | Ìý |
Finite-Lived Intangible Assets [Line Items] | Ìý | Ìý |
Definite lived intangible assets - Gross Carrying Amount |
78.7us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UseRightsMember |
79.2us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UseRightsMember |
Definite lived intangible assets - Accumulated Amortization |
(17.5)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UseRightsMember |
(16.5)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UseRightsMember |
Definite lived intangible assets - Net Carrying Amount |
61.2us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UseRightsMember |
62.7us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UseRightsMember |
Below Market Sales Contracts [Member] | Ìý | Ìý |
Finite-Lived Intangible Assets [Line Items] | Ìý | Ìý |
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 |
182.8us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = clf_BelowMarketSalesContractsMember |
182.8us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = clf_BelowMarketSalesContractsMember |
Definite lived intangible assets - Net Carrying Amount |
(46.1)us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = clf_BelowMarketSalesContractsMember |
(46.1)us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = clf_BelowMarketSalesContractsMember |
Below Market Sales Contracts [Member] | Other Current Liabilities [Member] | Ìý | Ìý |
Finite-Lived Intangible Assets [Line Items] | Ìý | Ìý |
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] | Ìý | Ìý |
Finite-Lived Intangible Assets [Line Items] | Ìý | Ìý |
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 |
182.8us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = clf_BelowMarketSalesContractsMember |
182.8us-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 |
$ (23.1)us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = clf_BelowMarketSalesContractsMember |
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- Definition
Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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