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ACCUMULATED OTHERCOMPREHENSIVE INCOME (LOSS) (Tables) | 12 Months Ended
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Dec. 31, 2018
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The components of Accumulated other comprehensive loss within Cliffs shareholders’ equity (deficit) and related tax effects allocated to each are shown below:
| (In Millions)
| Pre-tax Amount |  | Tax Benefit |  | After-tax Amount
As of December 31, 2018: |  |  |  |  |
Postretirement benefit liability | $ | (408.1 | ) |  | $ | 127.0 |  |  | $ | (281.1 | )
Unrealized net loss on derivative financial instruments | (3.5 | ) |  | 0.7 |  |  | (2.8 | )
| $ | (411.6 | ) |  | $ | 127.7 |  |  | $ | (283.9 | )
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 | )
The following tables reflect the changes in Accumulated other comprehensive loss related to Cliffs shareholders’ equity (deficit) for December 31, 2018, 2017 and 2016:
| (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 Loss
Balance December 31, 2017 | $ | (263.9 | ) |  | $ | 225.4 |  |  | $ | (0.5 | ) |  | $ | (39.0 | )
Other comprehensive income (loss) before reclassifications | (42.9 | ) |  | 2.7 |  |  | (0.6 | ) |  | (40.8 | )
Net loss (gain) reclassified from accumulated other comprehensive loss | 25.7 |  |  | (228.1 | ) |  | (1.7 | ) |  | (204.1 | )
Balance December 31, 2018 | $ | (281.1 | ) |  | $ | — |  |  | $ | (2.8 | ) |  | $ | (283.9 | )
| (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 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 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 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 loss | 25.6 |  |  | — |  |  | 0.2 |  |  | 0.7 |  |  | 26.5 |
Balance December 31, 2016 | $ | (260.6 | ) |  | $ | — |  |  | $ | 239.3 |  |  | $ | — |  |  | $ | (21.3 | )
ACCUMLATED OTHER COMPREHENSIVE INCOME (LOSS) | The following table reflects the details about Accumulated other comprehensive loss components related to Cliffs shareholders’ equity:
|  | (In Millions) |  |
Details about Accumulated Other Comprehensive Loss Components |  | Amount of (Gain)/Loss Reclassified into Income |  | Affected Line Item in the Statement of Consolidated Operations
|  | Year Ended December 31, 2018 |  | Year Ended December 31, 2017 |  | Year Ended December 31, 2016 |  |
Amortization of pension and postretirement benefit liability: |  |  |  |  |  |  |  |
Prior service costs 1 |  | $ | (0.8 | ) |  | $ | (0.4 | ) |  | $ | (1.5 | ) |  | Other non-operating income
Net actuarial loss 1 |  | 26.2 |  |  | 26.9 |  |  | 27.1 |  |  | Other non-operating income
Curtailments 1 |  | 0.3 |  |  | — |  |  | — |  |  | Other non-operating income
|  | $ | 25.7 |  |  | $ | 26.5 |  |  | $ | 25.6 |  |  | Net of taxes
Changes in foreign currency translation: |  |  |  |  |  |  |  |
Unrealized gain on dissolution of entity |  | $ | — |  |  | $ | — |  |  | $ | 0.2 |  |  | Other non-operating income
Gain on foreign currency translation 2 |  | (228.1 | ) |  | — |  |  | — |  |  | Income from discontinued operations, net of tax
|  | $ | (228.1 | ) |  | $ | — |  |  | $ | 0.2 |  |  | Net of taxes
Unrealized gain (loss) on derivative financial instruments: |  |  |  |  |  |  |  |
Treasury lock |  | $ | — |  |  | $ | — |  |  | $ | 1.2 |  |  | Gain (loss) on extinguishment/restructuring of debt
Commodity contracts |  | (1.7 | ) |  | — |  |  | — |  |  | Cost of goods sold and operating expenses
|  | (1.7 | ) |  | — |  |  | 1.2 |  |  | Total before taxes
Income tax expense |  | — |  |  | — |  |  | (0.5 | ) |  | Income tax benefit
|  | $ | (1.7 | ) |  | $ | — |  |  | $ | 0.7 |  |  | Net of taxes
Total reclassifications for the period |  | $ | (204.1 | ) |  | $ | 26.5 |  |  | $ | 26.5 |  |  |
1 These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See NOTE 8 - PENSIONS AND OTHER POSTRETIREMENT BENEFITS for further information.
2 Represents Australian accumulated currency translation adjustments due to the liquidation of substantially all of our Australian subsidiaries' net assets. See NOTE 13 - 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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