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Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2021
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | The following table presents the changes in the accumulated balances for each component of AOCI (in millions of dollars):
|  | Quarter Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Defined Benefit Pension Plan and Salaried VEBA: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | (19.1 | ) |  | $ | (32.1 | ) |  | $ | (19.8 | ) |  | $ | (33.2 | )
Amortization of net actuarial loss1 |  |  | 0.1 |  |  |  | 0.1 |  |  |  | 0.2 |  |  |  | 0.2 |
Amortization of prior service cost1 |  |  | 0.8 |  |  |  | 1.1 |  |  |  | 1.7 |  |  |  | 2.3 |
Less: income tax expense2 |  |  | (0.2 | ) |  |  | (0.3 | ) |  |  | (0.5 | ) |  |  | (0.6 | )
Net amortization reclassified from AOCI to Net (loss) income |  |  | 0.7 |  |  |  | 0.9 |  |  |  | 1.4 |  |  |  | 1.9 |
Translation impact on Canadian pension plan AOCI balance |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.1 |
Other comprehensive income, net of tax |  |  | 0.7 |  |  |  | 0.9 |  |  |  | 1.4 |  |  |  | 2.0 |
Ending balance |  | $ | (18.4 | ) |  | $ | (31.2 | ) |  | $ | (18.4 | ) |  | $ | (31.2 | )
Available for Sale Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | — |  |  | $ | 0.1 |  |  | $ | — |  |  | $ | 0.3 |
Unrealized gain on available for sale securities |  |  | — |  |  |  | 0.1 |  |  |  | — |  |  |  | 1.4 |
Less: income tax benefit (expense) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (0.3 | )
Net unrealized gain on available for sale securities |  |  | — |  |  |  | 0.1 |  |  |  | — |  |  |  | 1.1 |
Reclassification of unrealized loss (gain) upon sale of available for sale securities3 |  |  | — |  |  |  | (0.6 | ) |  |  | — |  |  |  | (2.1 | )
Less: income tax benefit2 |  |  | — |  |  |  | 0.2 |  |  |  | — |  |  |  | 0.5 |
Net loss (gain) reclassified from AOCI to Net (loss) income |  |  | — |  |  |  | (0.4 | ) |  |  | — |  |  |  | (1.6 | )
Other comprehensive income (loss), net of tax |  |  | — |  |  |  | (0.3 | ) |  |  | — |  |  |  | (0.5 | )
Ending balance |  | $ | — |  |  | $ | (0.2 | ) |  | $ | — |  |  | $ | (0.2 | )
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | 9.6 |  |  | $ | (21.5 | ) |  | $ | 1.1 |  |  | $ | (5.6 | )
Unrealized gain (loss) on cash flow hedges |  |  | 28.4 |  |  |  | 4.1 |  |  |  | 42.3 |  |  |  | (23.8 | )
Less: income tax (expense) benefit |  |  | (6.7 | ) |  |  | (0.9 | ) |  |  | (10.0 | ) |  |  | 5.9 |
Net unrealized gain (loss) on cash flow hedges |  |  | 21.7 |  |  |  | 3.2 |  |  |  | 32.3 |  |  |  | (17.9 | )
Reclassification of unrealized (gain) loss upon settlement of cash flow hedges4 |  |  | (8.7 | ) |  |  | 9.3 |  |  |  | (11.4 | ) |  |  | 16.3 |
Reclassification due to forecasted transactions no longer probable of occurring4 |  |  | — |  |  |  | 0.7 |  |  |  | — |  |  |  | 0.7 |
Less: income tax benefit (expense)2 |  |  | 2.2 |  |  |  | (2.4 | ) |  |  | 2.8 |  |  |  | (4.2 | )
Net (gain) loss reclassified from AOCI to Net (loss) income |  |  | (6.5 | ) |  |  | 7.6 |  |  |  | (8.6 | ) |  |  | 12.8 |
Other comprehensive income (loss), net of tax |  |  | 15.2 |  |  |  | 10.8 |  |  |  | 23.7 |  |  |  | (5.1 | )
Ending balance |  | $ | 24.8 |  |  | $ | (10.7 | ) |  | $ | 24.8 |  |  | $ | (10.7 | )
Fair Value Hedges: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | — |  |  | $ | (0.5 | ) |  | $ | — |  |  | $ | — |
Unrealized gain (loss) on fair value hedges |  |  | — |  |  |  | (0.2 | ) |  |  | — |  |  |  | (1.0 | )
Less: income tax benefit |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.2 |
Net unrealized gain (loss) on fair value hedges |  |  | — |  |  |  | (0.2 | ) |  |  | — |  |  |  | (0.8 | )
Excluded component amortized from OCI to Net income |  |  | — |  |  |  | 0.2 |  |  |  | — |  |  |  | 0.4 |
Reclassification due to cancellation of firm commitment |  |  | — |  |  |  | 0.6 |  |  |  | — |  |  |  | 0.6 |
Less: income tax benefit (expense)2 |  |  | — |  |  |  | (0.1 | ) |  |  | — |  |  |  | (0.2 | )
Net loss reclassified from AOCI to Net (loss) income |  |  | — |  |  |  | 0.7 |  |  |  | — |  |  |  | 0.8 |
Other comprehensive income, net of tax |  |  | — |  |  |  | 0.5 |  |  |  | — |  |  |  | — |
Ending balance |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Foreign Currency Translation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | (0.1 | ) |  | $ | (0.1 | ) |  | $ | — |  |  | $ | (0.1 | )
Other comprehensive income (loss), net of tax |  |  | — |  |  |  | — |  |  |  | (0.1 | ) |  |  | — |
Ending balance |  | $ | (0.1 | ) |  | $ | (0.1 | ) |  | $ | (0.1 | ) |  | $ | (0.1 | )
Total AOCI ending balance |  | $ | 6.3 |  |  | $ | (42.2 | ) |  | $ | 6.3 |  |  | $ | (42.2 | )
1 | Amounts amortized out of AOCI relating to Salaried VEBA adjustments were included within Other (expense) 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 benefit (provision).
3 | Amounts reclassified out of AOCI relating to sales of available for sale securities were included as a component of Other income (expense), net. We use the specific identification method to determine the amount reclassified out of AOCI.
4 | As of June 30, 2021, we estimate a net mark-to-market gain before tax of $28.7 million in AOCI will be reclassified into Net (loss) income upon settlement 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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: 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=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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