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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
ACCUMLATED OTHER COMPREHENSIVE INCOME (LOSS) | NOTE 16 - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) 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 | )
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 | )
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 The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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