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CASH FLOW INFORMATION (Reconciliation Of Capital Additions To Cash Paid For Capital Expenditures) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Payments To Acquire Property Plant And Equipment Net | $ 284.1 clf_PaymentsToAcquirePropertyPlantAndEquipmentNet | $ 861.6 clf_PaymentsToAcquirePropertyPlantAndEquipmentNet | $ 1,127.5 clf_PaymentsToAcquirePropertyPlantAndEquipmentNet
Property, Plant and Equipment, Additions | 235.5 us-gaap_PropertyPlantAndEquipmentAdditions | 752.3 us-gaap_PropertyPlantAndEquipmentAdditions | 1,335.3 us-gaap_PropertyPlantAndEquipmentAdditions
Non-cash accruals | (58.5)us-gaap_CapitalExpendituresIncurredButNotYetPaid | (109.3)us-gaap_CapitalExpendituresIncurredButNotYetPaid | 152.5 us-gaap_CapitalExpendituresIncurredButNotYetPaid
Capital leases | 9.9 us-gaap_CapitalLeaseObligationsIncurred | 0 us-gaap_CapitalLeaseObligationsIncurred | 55.3 us-gaap_CapitalLeaseObligationsIncurred
Total | $ (48.6)clf_CapitalExpendituresIncurredButNotYetPaidAndCapitalLeaseObligationsIncurred | $ (109.3)clf_CapitalExpendituresIncurredButNotYetPaidAndCapitalLeaseObligationsIncurred | $ 207.8 clf_CapitalExpendituresIncurredButNotYetPaidAndCapitalLeaseObligationsIncurred

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- Definition Future cash outflow to pay for purchases of fixed assets that have occurred and the increase during the period in capital lease obligations due to entering into new capital leases. + References No definition available. + Details
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Namespace Prefix: | clf_
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Period Type: | duration

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- Definition Payments To Acquire Property Plant And Equipment, Net + References No definition available. + Details
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Namespace Prefix: | clf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Future cash outflow to pay for purchases of fixed assets that have occurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition The increase during the period in capital lease obligations due to entering into new capital leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAdditions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration