XML 36 R76.htm IDEA: XBRL DOCUMENT
v2.4.1.9

GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Schedule Of Goodwill) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Goodwill [Roll Forward] |  |
Beginning Balance | $ 2.0 us-gaap_Goodwill | $ 74.5 us-gaap_Goodwill
Arising in business combinations | 0 us-gaap_GoodwillAcquiredDuringPeriod | 0 us-gaap_GoodwillAcquiredDuringPeriod
Impairment | 0 us-gaap_GoodwillImpairmentLoss | (73.5)us-gaap_GoodwillImpairmentLoss
Impact of foreign currency translation | 0 us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments | 1.0 us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
Ending Balance | 2.0 us-gaap_Goodwill | 2.0 us-gaap_Goodwill
Accumulated goodwill impairment loss | (73.5)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | (73.5)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
U.S. Iron Ore [Member] |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 2.0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember | 2.0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember
Arising in business combinations | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember
Impairment | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember
Impact of foreign currency translation | 0 us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember | 0 us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember
Ending Balance | 2.0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember | 2.0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember
Accumulated goodwill impairment loss | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember
Asia Pacific Iron Ore [Member] |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = clf_AsiaPacificIronOreMember | 72.5 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = clf_AsiaPacificIronOreMember
Arising in business combinations | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = clf_AsiaPacificIronOreMember | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = clf_AsiaPacificIronOreMember
Impairment | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = clf_AsiaPacificIronOreMember | (73.5)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = clf_AsiaPacificIronOreMember
Impact of foreign currency translation | 0 us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = clf_AsiaPacificIronOreMember | 1.0 us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = clf_AsiaPacificIronOreMember
Ending Balance | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = clf_AsiaPacificIronOreMember | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = clf_AsiaPacificIronOreMember
Accumulated goodwill impairment loss | $ (73.5)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = clf_AsiaPacificIronOreMember | $ (73.5)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = clf_AsiaPacificIronOreMember

X
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillAcquiredDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillImpairmentLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_GoodwillRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=clf_AsiaPacificIronOreMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=clf_USIronOreMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |