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ACCUMULATED OTHERCOMPREHENSIVE INCOME (LOSS) (Tables) | 12 Months Ended
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Dec. 31, 2017
Schedule of Accumulate Other Comprehensive Income (Loss) and Related Tax Effects [Table Text Block] | The components of Accumulated other comprehensive loss within Cliffs shareholders’ deficit and related tax effects allocated to each are shown below as of December 31, 2017, 2016 and 2015:
| (In Millions)
| Pre-tax Amount |  | Tax Benefit |  | After-tax Amount
As of December 31, 2017: |  |  |  |  |
Postretirement benefit liability | $ | (387.3 | ) |  | $ | 123.4 |  |  | $ | (263.9 | )
Foreign currency translation adjustments | 225.4 |  |  | — |  |  | 225.4 |
Unrealized net loss on derivative financial instruments | (0.5 | ) |  | — |  |  | (0.5 | )
| $ | (162.4 | ) |  | $ | 123.4 |  |  | $ | (39.0 | )
As of December 31, 2016: |  |  |  |  |
Postretirement benefit liability | $ | (384.0 | ) |  | $ | 123.4 |  |  | $ | (260.6 | )
Foreign currency translation adjustments | 239.3 |  |  | — |  |  | 239.3 |
| $ | (144.7 | ) |  | $ | 123.4 |  |  | $ | (21.3 | )
As of December 31, 2015: |  |  |  |  |
Postretirement benefit liability | $ | (364.8 | ) |  | $ | 123.4 |  |  | $ | (241.4 | )
Foreign currency translation adjustments | 220.7 |  |  | — |  |  | 220.7 |
Unrealized net gain on derivative financial instruments | 2.2 |  |  | 0.4 |  |  | 2.6 |
Unrealized gain on securities | 0.1 |  |  | — |  |  | 0.1 |
| $ | (141.8 | ) |  | $ | 123.8 |  |  | $ | (18.0 | )
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The following tables reflect the changes in Accumulated other comprehensive loss related to Cliffs shareholders’ equity for December 31, 2017, 2016 and 2015:
| (In Millions)
| Postretirement Benefit Liability, net of tax |  | Unrealized Net Gain (Loss) on Foreign Currency Translation |  | Net Unrealized Loss on Derivative Financial Instruments, net of tax |  | Accumulated Other Comprehensive Income (Loss)
Balance December 31, 2016 | $ | (260.6 | ) |  | $ | 239.3 |  |  | $ | — |  |  | $ | (21.3 | )
Other comprehensive loss before reclassifications | (29.8 | ) |  | (13.9 | ) |  | (0.5 | ) |  | (44.2 | )
Net loss reclassified from accumulated other comprehensive income (loss) | 26.5 |  |  | — |  |  | — |  |  | 26.5 |
Balance December 31, 2017 | $ | (263.9 | ) |  | $ | 225.4 |  |  | $ | (0.5 | ) |  | $ | (39.0 | )
| (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 (Loss) on Derivative Financial Instruments, net of tax |  | Accumulated Other Comprehensive Income (Loss)
Balance December 31, 2015 | $ | (241.4 | ) |  | $ | 0.1 |  |  | $ | 220.7 |  |  | $ | 2.6 |  |  | $ | (18.0 | )
Other comprehensive income (loss) before reclassifications | (44.8 | ) |  | (0.1 | ) |  | 18.4 |  |  | (3.3 | ) |  | (29.8 | )
Net loss reclassified from accumulated other comprehensive income (loss) | 25.6 |  |  | — |  |  | 0.2 |  |  | 0.7 |  |  | 26.5 |
Balance December 31, 2016 | $ | (260.6 | ) |  | $ | — |  |  | $ | 239.3 |  |  | $ | — |  |  | $ | (21.3 | )
| (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, 2014 | $ | (291.1 | ) |  | $ | (1.0 | ) |  | $ | 64.4 |  |  | $ | (18.1 | ) |  | $ | (245.8 | )
Other comprehensive income (loss) before reclassifications | 9.1 |  |  | 5.4 |  |  | (26.4 | ) |  | 1.9 |  |  | (10.0 | )
Net loss (gain) reclassified from accumulated other comprehensive income (loss) | 40.6 |  |  | (4.3 | ) |  | 182.7 |  |  | 18.8 |  |  | 237.8 |
Balance December 31, 2015 | $ | (241.4 | ) |  | $ | 0.1 |  |  | $ | 220.7 |  |  | $ | 2.6 |  |  | $ | (18.0 | )
Details of Accumulated Other Comprehensive Income (Loss) Components [Table Text Block] | The following table reflects the details about Accumulated other comprehensive loss components related to Cliffs shareholders’ equity for the years ended December 31, 2017, 2016 and 2015:
|  | (In Millions) |  |
Details about Accumulated Other Comprehensive Income (Loss) Components |  | Amount of (Gain)/Loss Reclassified into Income |  | Affected Line Item in the Statement of Consolidated Operations
|  | Year Ended December 31, 2017 |  | Year Ended December 31, 2016 |  | Year Ended December 31, 2015 |  |
Amortization of Pension and Postretirement Benefit Liability: |  |  |  |  |  |  |  |
Prior service costs 1 |  | $ | (0.4 | ) |  | $ | (1.5 | ) |  | $ | (1.4 | ) |  |
Net actuarial loss 1 |  | 26.9 |  |  | 27.1 |  |  | 27.4 |  |  |
Curtailments/Settlements 1 |  | — |  |  | — |  |  | 0.2 |  |  |
Effect of deconsolidation 2 |  | — |  |  | — |  |  | 15.1 |  |  | Loss from Discontinued Operations, net of tax
|  | 26.5 |  |  | 25.6 |  |  | 41.3 |  |  | Total before taxes
|  | — |  |  | — |  |  | (0.7 | ) |  | Income tax benefit (expense)
|  | $ | 26.5 |  |  | $ | 25.6 |  |  | $ | 40.6 |  |  | Net of taxes
Unrealized loss on marketable securities: |  |  |  |  |  |  |  |
Sale of marketable securities |  | $ | — |  |  | $ | — |  |  | $ | (2.6 | ) |  | Other non-operating income (expense)
Impairment |  | — |  |  | — |  |  | (2.0 | ) |  | Other non-operating income (expense)
|  | — |  |  | — |  |  | (4.6 | ) |  | Total before taxes
|  | — |  |  | — |  |  | 0.3 |  |  | Income tax benefit (expense)
|  | $ | — |  |  | $ | — |  |  | $ | (4.3 | ) |  | Net of taxes
Unrealized gain on foreign currency translation: |  |  |  |  |  |  |  |
Dissolution of entity |  | $ | — |  |  | $ | 0.2 |  |  | $ | — |  |  | Other non-operating income (expense)
Effect of deconsolidation 3 |  | — |  |  | — |  |  | 182.7 |  |  | Loss from Discontinued Operations, net of tax
|  | $ | — |  |  | $ | 0.2 |  |  | $ | 182.7 |  |  | Net of taxes
Unrealized gain on derivative financial instruments: |  |  |  |  |  |  |  |
Treasury lock |  | $ | — |  |  | $ | 1.2 |  |  | $ | — |  |  | Gain (loss) on extinguishment/restructuring of debt
Australian dollar foreign exchange contracts |  | — |  |  | — |  |  | 26.9 |  |  | Product revenues
|  | — |  |  | 1.2 |  |  | 26.9 |  |  | Total before taxes
|  | — |  |  | (0.5 | ) |  | (8.1 | ) |  | Income tax benefit (expense)
|  | $ | — |  |  | $ | 0.7 |  |  | $ | 18.8 |  |  | Net of taxes
Total Reclassifications for the Period |  | $ | 26.5 |  |  | $ | 26.5 |  |  | $ | 237.8 |  |  |
1 These accumulated other comprehensive income components are included in the computation of net periodic benefit cost. See NOTE 7 - PENSIONS AND OTHER POSTRETIREMENT BENEFITS for further information.
2 Represents Canadian postretirement benefit liabilities that were deconsolidated. See NOTE 14 - DISCONTINUED OPERATIONS for further information.
3 Represents Canadian accumulated currency translation adjustments that were deconsolidated. See NOTE 14 - DISCONTINUED OPERATIONS 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=84228862&loc=SL7669686-108580 + Details
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