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Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 31, 2019
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | The following table presents the changes in the accumulated balances for each component of AOCI for each period presented (in millions of dollars):
|  | Quarter Ended
|  | March 31,
|  | 2019 |  | 2018
Defined Benefit Pension Plan and Salaried VEBA: |  |  |  |
Beginning balance |  | $ | (35.6 | ) |  | $ | (38.5 | )
Amortization of net actuarial loss 1 |  | 0.1 |  |  | 0.2 |
Amortization of prior service cost 1 |  | 1.4 |  |  | 1.3 |
Less: income tax expense 2 |  | (0.4 | ) |  | (0.3 | )
Net amortization reclassified from AOCI to Net income |  | 1.1 |  |  | 1.2 |
Other comprehensive income, net of tax |  | 1.1 |  |  | 1.2 |
Ending balance |  | $ | (34.5 | ) |  | $ | (37.3 | )
Available for Sale Securities: |  |  |  |
Beginning balance |  | $ | 0.3 |  |  | $ | 0.9 |
Unrealized gain on available for sale securities |  | 1.0 |  |  | 1.0 |
Less: income tax expense |  | (0.3 | ) |  | (0.2 | )
Net unrealized gain on available for sale securities |  | 0.7 |  |  | 0.8 |
Reclassification of unrealized gain upon sale of available for sale securities 3 |  | (1.2 | ) |  | (1.5 | )
Less: income tax benefit 2 |  | 0.3 |  |  | 0.5 |
Net gain reclassified from AOCI to Net income |  | (0.9 | ) |  | (1.0 | )
Other comprehensive loss, net of tax |  | (0.2 | ) |  | (0.2 | )
Ending balance |  | $ | 0.1 |  |  | $ | 0.7 |
Cash Flow Hedges: |  |  |  |
Beginning balance |  | $ | (13.4 | ) |  | $ | 0.5 |
Unrealized gain (loss) on cash flow hedges |  | 7.4 |  |  | (12.2 | )
Less: income tax (expense) benefit |  | (1.8 | ) |  | 3.0 |
Net unrealized gain (loss) on cash flow hedges |  | 5.6 |  |  | (9.2 | )
Reclassification of unrealized loss (gain) upon settlement of cash flow hedges 4 |  | 4.2 |  |  | (0.1 | )
Less: income tax expense 2 |  | (1.0 | ) |  | — |
Net loss (gain) reclassified from AOCI to Net income |  | 3.2 |  |  | (0.1 | )
Other comprehensive income (loss), net of tax |  | 8.8 |  |  | (9.3 | )
Ending balance |  | $ | (4.6 | ) |  | $ | (8.8 | )
Foreign Currency Translation: |  |  |  |
Beginning balance |  | $ | (0.1 | ) |  | $ | — |
Other comprehensive income, net of tax |  | — |  |  | — |
Ending balance |  | $ | (0.1 | ) |  | $ | — |
Total AOCI ending balance |  | $ | (39.1 | ) |  | $ | (45.4 | )
____________________
1 | Amounts amortized out of AOCI relating to Salaried VEBA adjustments were included within Other income, net, as a component of Net periodic postretirement benefit cost relating to Salaried VEBA.
2 | Income tax amounts reclassified out of AOCI were included as a component of Income tax provision.
3 | Amounts reclassified out of AOCI relating to sales of available for sale securities were included as a component of Other income, net. We use the specific identification method to determine the amount reclassified out of AOCI.
4 Amounts reclassified out of AOCI relating to cash flow hedges were included as a component of COGS. As of March 31, 2019, we estimate a net mark-to-market loss before tax of $7.4 million in AOCI will be reclassified into Net income within the next 12 months.

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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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