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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2022
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 March 31, |
|  | 2022 |  |  | 2021 |
Defined Benefit Pension Plan and Salaried VEBA: |  |  |  |  |  |  |  |
Beginning balance |  | $ | (21.4 | ) |  | $ | (19.8 | )
Amortization of net actuarial loss1 |  |  | — |  |  |  | 0.1 |
Amortization of prior service cost1 |  |  | 1.2 |  |  |  | 0.9 |
Less: income tax expense2 |  |  | (0.3 | ) |  |  | (0.3 | )
Other comprehensive income, net of tax |  |  | 0.9 |  |  |  | 0.7 |
Ending balance |  | $ | (20.5 | ) |  | $ | (19.1 | )
Cash Flow Hedges: |  |  |  |  |  |  |  |
Beginning balance |  | $ | 17.7 |  |  | $ | 1.1 |
Unrealized gain on cash flow hedges |  |  | 42.3 |  |  |  | 13.9 |
Less: income tax expense |  |  | (10.0 | ) |  |  | (3.3 | )
Net unrealized gain on cash flow hedges |  |  | 32.3 |  |  |  | 10.6 |
Reclassification of unrealized gain upon settlement of cash flow hedges |  |  | (19.9 | ) |  |  | (2.7 | )
Less: income tax benefit2 |  |  | 4.7 |  |  |  | 0.6 |
Net gain reclassified from AOCI to Net income |  |  | (15.2 | ) |  |  | (2.1 | )
Other comprehensive income, net of tax |  |  | 17.1 |  |  |  | 8.5 |
Ending balance3 |  | $ | 34.8 |  |  | $ | 9.6 |
Foreign Currency Translation: |  |  |  |  |  |  |  |
Beginning balance |  | $ | — |  |  | $ | — |
Other comprehensive income (loss), net of tax |  |  | — |  |  |  | (0.1 | )
Ending balance |  | $ | — |  |  | $ | (0.1 | )
Total AOCI ending balance |  | $ | 14.3 |  |  | $ | (9.6 | )
1 | Amounts amortized out of AOCI relating to Salaried VEBA adjustments were included within Other expense, 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) benefit.
3 | As of March 31, 2022, we estimate a net mark-to-market gain before tax of $41.6 million in AOCI will be reclassified into Net 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=124509347&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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