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CASH FLOW INFORMATION (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Nov. 19, 2014 | Nov. 03, 2014 | Aug. 01, 2014 | Feb. 03, 2014 | Nov. 01, 2013 | Aug. 01, 2013 | Mar. 20, 2013
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depositary Share Interest in a Share of 7% Series A Mandatory Convertible Preferred Stock, Class A |  |  |  |  | 0.025 clf_DepositaryShareInterestInShareOf7SeriesMandatoryConvertiblePreferredStockClassA |  |  |  |  |  |  |  |  |
Preferred stock cash dividend | $ 12.8 us-gaap_DividendsPreferredStock | $ 12.8 us-gaap_DividendsPreferredStock | $ 12.8 us-gaap_DividendsPreferredStock | $ 12.8 us-gaap_DividendsPreferredStock | $ 51.2 us-gaap_DividendsPreferredStock | $ 48.7 us-gaap_DividendsPreferredStock | $ 0 us-gaap_DividendsPreferredStock |  |  |  |  |  |  |
Preferred Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series A Mandatory Convertible Preferred Stock, Class A, Percentage |  |  |  |  | 7.00%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember |  |  |  |  |  |  |  |  |
Dividends payable, per share |  |  |  |  |  |  |  | $ 17.50 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember | $ 17.5000 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember | $ 0.44 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember | $ 0.44 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember | $ 0.44 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember | $ 17.50 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember | $ 13.6111 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember
Preferred stock cash dividend | $ 12.8 us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember |  |  |  | $ 51.2 us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember |  |  |  |  |  |  |  |  |
Depositary Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, per share |  |  |  |  |  |  |  | $ 0.44 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = clf_DepositarySharesMember | $ 0.44 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = clf_DepositarySharesMember | $ 17.5000 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = clf_DepositarySharesMember | $ 17.5000 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = clf_DepositarySharesMember | $ 17.5000 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = clf_DepositarySharesMember | $ 0.44 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = clf_DepositarySharesMember | $ 0.34 us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementClassOfStockAxis = clf_DepositarySharesMember

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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: 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 paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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