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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ACCUMULATED OTHERCOMPREHENSIVE INCOME (LOSS) (Tables) | 12 Months Ended
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Dec. 31, 2014
Equity [Abstract] |
Schedule of Accumulate Other Comprehensive Income (Loss) and Related Tax Effects [Table Text Block] | The components of Accumulated other comprehensive income (loss) within Cliffs shareholders’ equity and related tax effects allocated to each are shown below as of December 31, 2014, 2013 and 2012:
| (In Millions)
| Pre-tax Amount |  | Tax Benefit (Provision) |  | After-tax Amount
As of December 31, 2012: |  |  |  |  |
Postretirement benefit liability | $ | (576.7 | ) |  | $ | 194.0 |  |  | $ | (382.7 | )
Foreign currency translation adjustments | 316.3 |  |  | — |  |  | 316.3 |
Unrealized net gain on derivative financial instruments | 12.4 |  |  | (3.7 | ) |  | 8.7 |
Unrealized gain on securities | 3.3 |  |  | (1.2 | ) |  | 2.1 |
| $ | (244.7 | ) |  | $ | 189.1 |  |  | $ | (55.6 | )
As of December 31, 2013: |  |  |  |  |
Postretirement benefit liability | $ | (299.3 | ) |  | $ | 94.4 |  |  | $ | (204.9 | )
Foreign currency translation adjustments | 106.7 |  |  | — |  |  | 106.7 |
Unrealized net gain on derivative financial instruments | (30.0 | ) |  | 9.1 |  |  | (20.9 | )
Unrealized gain on securities | 9.3 |  |  | (3.1 | ) |  | 6.2 |
| $ | (213.3 | ) |  | $ | 100.4 |  |  | $ | (112.9 | )
As of December 31, 2014: |  |  |  |  |
Postretirement benefit liability | $ | (425.3 | ) |  | $ | 134.2 |  |  | $ | (291.1 | )
Foreign currency translation adjustments | 64.4 |  |  | — |  |  | 64.4 |
Unrealized net loss on derivative financial instruments | (25.9 | ) |  | 7.8 |  |  | (18.1 | )
Unrealized gain on securities | (1.3 | ) |  | 0.3 |  |  | (1.0 | )
| $ | (388.1 | ) |  | $ | 142.3 |  |  | $ | (245.8 | )
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The following tables reflect the changes in Accumulated other comprehensive income (loss) related to Cliffs shareholders’ equity for December 31, 2014, 2013 and 2012:
| (In Millions)
| Postretirement Benefit Liability, net of tax |  | Unrealized Net Gain (Loss) on Securities, net of tax |  | Unrealized Net Gain (Loss) on Foreign Currency Translation |  | Net Unrealized Gain (Loss) on Derivative Financial Instruments, net of tax |  | Accumulated Other Comprehensive Income (Loss)
Balance December 31, 2013 | $ | (204.9 | ) |  | $ | 6.2 |  |  | $ | 106.7 |  |  | $ | (20.9 | ) |  | $ | (112.9 | )
Other comprehensive income (loss) before reclassifications | (0.4 | ) |  | 3.8 |  |  | 40.5 |  |  | (2.3 | ) |  | 41.6 |
Net loss (gain) reclassified from accumulated other comprehensive income (loss) | 3.3 |  |  | 0.1 |  |  | — |  |  | 12.8 |  |  | 16.2 |
Balance March 31, 2014 | $ | (202.0 | ) |  | $ | 10.1 |  |  | $ | 147.2 |  |  | $ | (10.4 | ) |  | $ | (55.1 | )
Other comprehensive loss before reclassifications | (1.4 | ) |  | (2.4 | ) |  | 19.7 |  |  | 9.7 |  |  | 25.6 |
Net loss (gain) reclassified from accumulated other comprehensive income (loss) | 4.0 |  |  | (1.3 | ) |  | — |  |  | 6.6 |  |  | 9.3 |
Balance June 30, 2014 | $ | (199.4 | ) |  | $ | 6.4 |  |  | $ | 166.9 |  |  | $ | 5.9 |  |  | $ | (20.2 | )
Other comprehensive income (loss) before reclassifications | 3.5 |  |  | 1.3 |  |  | (65.9 | ) |  | (20.0 | ) |  | (81.1 | )
Net loss (gain) reclassified from accumulated other comprehensive income (loss) | 7.6 |  |  | (7.1 | ) |  | — |  |  | (0.6 | ) |  | (0.1 | )
Balance September 30, 2014 | $ | (188.3 | ) |  | $ | 0.6 |  |  | $ | 101.0 |  |  | $ | (14.7 | ) |  | $ | (101.4 | )
Other comprehensive income (loss) before reclassifications | $ | (98.7 | ) |  | $ | (1.4 | ) |  | $ | (36.6 | ) |  | $ | (15.6 | ) |  | $ | (152.3 | )
Net loss (gain) reclassified from accumulated other comprehensive income (loss) | $ | (4.1 | ) |  | $ | (0.2 | ) |  | $ | — |  |  | $ | 12.2 |  |  | $ | 7.9 |
Balance December 31, 2014 | $ | (291.1 | ) |  | $ | (1.0 | ) |  | $ | 64.4 |  |  | $ | (18.1 | ) |  | $ | (245.8 | )
| (In Millions)
| Postretirement Benefit Liability, net of tax |  | Unrealized Net Gain (Loss) on Securities, net of tax |  | Unrealized Net Gain (Loss) on Foreign Currency Translation |  | Net Unrealized Gain (Loss) on Derivative Financial Instruments, net of tax |  | Accumulated Other Comprehensive Income (Loss)
Balance December 31, 2012 | $ | (382.7 | ) |  | $ | 2.1 |  |  | $ | 316.3 |  |  | $ | 8.7 |  |  | $ | (55.6 | )
Other comprehensive income (loss) before reclassifications | (1.1 | ) |  | 2.5 |  |  | 3.3 |  |  | (5.0 | ) |  | (0.3 | )
Net loss (gain) reclassified from accumulated other comprehensive income (loss) | 6.4 |  |  | 0.1 |  |  | — |  |  | (2.0 | ) |  | 4.5 |
Balance March 31, 2013 | $ | (377.4 | ) |  | $ | 4.7 |  |  | $ | 319.6 |  |  | $ | 1.7 |  |  | $ | (51.4 | )
Other comprehensive loss before reclassifications | (1.5 | ) |  | (2.0 | ) |  | (152.0 | ) |  | (42.2 | ) |  | (197.7 | )
Net loss (gain) reclassified from accumulated other comprehensive income (loss) | 8.1 |  |  | 3.6 |  |  | — |  |  | (2.2 | ) |  | 9.5 |
Balance June 30, 2013 | $ | (370.8 | ) |  | $ | 6.3 |  |  | $ | 167.6 |  |  | $ | (42.7 | ) |  | $ | (239.6 | )
Other comprehensive income (loss) before reclassifications | (0.6 | ) |  | 3.5 |  |  | 22.8 |  |  | 12.1 |  |  | 37.8 |
Net loss (gain) reclassified from accumulated other comprehensive income (loss) | 6.3 |  |  | 0.9 |  |  | — |  |  | 16.2 |  |  | 23.4 |
Balance September 30, 2013 | $ | (365.1 | ) |  | $ | 10.7 |  |  | $ | 190.4 |  |  | $ | (14.4 | ) |  | $ | (178.4 | )
Other comprehensive income (loss) before reclassifications | $ | 154.5 |  |  | $ | (4.9 | ) |  | $ | (83.7 | ) |  | $ | (16.6 | ) |  | $ | 49.3 |
Net loss (gain) reclassified from accumulated other comprehensive income (loss) | $ | 5.7 |  |  | $ | 0.4 |  |  | $ | — |  |  | $ | 10.1 |  |  | $ | 16.2 |
Balance December 31, 2013 | $ | (204.9 | ) |  | $ | 6.2 |  |  | $ | 106.7 |  |  | $ | (20.9 | ) |  | $ | (112.9 | )
| (In Millions)
| Postretirement Benefit Liability, net of tax |  | Unrealized Net Gain (Loss) on Securities, net of tax |  | Unrealized Net Gain on Foreign Currency Translation |  | Net Unrealized Gain on Derivative Financial Instruments, net of tax |  | Accumulated Other Comprehensive Income (Loss)
Balance December 31, 2011 | $ | (408.9 | ) |  | $ | 2.6 |  |  | $ | 312.5 |  |  | $ | 1.2 |  |  | $ | (92.6 | )
Change during 2012 | 26.2 |  |  | (0.5 | ) |  | 3.8 |  |  | 7.5 |  |  | 37.0 |
Balance December 31, 2012 | $ | (382.7 | ) |  | $ | 2.1 |  |  | $ | 316.3 |  |  | $ | 8.7 |  |  | $ | (55.6 | )
Details of Accumulated Other Comprehensive Income (Loss) Components [Table Text Block] | he following table reflects the details about Accumulated other comprehensive income (loss) components related to Cliffs shareholders’ equity for the year ended December 31, 2014:
|  | (In Millions) |  |
Details about Accumulated Other Comprehensive Income (Loss) Components |  | Amount of (Gain)/Loss Reclassified into Income |  | Affected Line Item in the Statement of Unaudited Condensed Consolidated Operations
|  | Year Ended December 31, 2014 |  | Year Ended December 31, 2013 |  |
Amortization of Pension and Postretirement Benefit Liability: |  |  |  |  |  |
Prior service costs |  | $ | (0.9 | ) |  | $ | (0.6 | ) |  | (1)
Net actuarial loss |  | 19.1 |  |  | 41.4 |  |  | (1)
Curtailments/Settlements |  | (5.0 | ) |  | — |  |  | (1)
Special termination benefits |  | 3.4 |  |  | — |  |  | (1)
|  | 16.6 |  |  | 40.8 |  |  | Total before taxes
|  | (5.8 | ) |  | (14.3 | ) |  | Income tax benefit (expense)
|  | $ | 10.8 |  |  | $ | 26.5 |  |  | Net of taxes
Unrealized gain (loss) on marketable securities: |  |  |  |  |  |
Sale of marketable securities |  | $ | (11.4 | ) |  | $ | (0.2 | ) |  | Other non-operating income (expense)
Impairment |  | (0.5 | ) |  | 5.3 |  |  | Other non-operating income (expense)
|  | (11.9 | ) |  | 5.1 |  |  | Total before taxes
|  | 3.4 |  |  | (0.1 | ) |  | Income tax benefit (expense)
|  | $ | (8.5 | ) |  | $ | 5.0 |  |  | Net of taxes
Unrealized gain (loss) on derivative financial instruments: |  |  |  |  |  |
Australian dollar foreign exchange contracts |  | $ | 18.9 |  |  | $ | 17.0 |  |  | Product revenues
Canadian dollar foreign exchange contracts |  | 26.7 |  |  | 15.3 |  |  | Cost of goods sold and operating expenses
|  | 45.6 |  |  | 32.3 |  |  | Total before taxes
|  | (14.6 | ) |  | (10.2 | ) |  | Income tax benefit (expense)
|  | $ | 31.0 |  |  | $ | 22.1 |  |  | Net of taxes
Total Reclassifications for the Period |  | $ | 33.3 |  |  | $ | 53.6 |  |  |
(1) | These accumulated other comprehensive income components are included in the net periodic benefit cost recognized for the year ended December 31, 2014 and 2013. See NOTE 7 - PENSIONS AND OTHER POSTRETIREMENT BENEFITS for further information.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 + Details
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