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Accumulated Other Comprehensive (Loss) Income (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, |  |  | Nine Months Ended September 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Defined Benefit Pension Plans and Salaried VEBA: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | (19.6 | ) |  | $ | (18.4 | ) |  | $ | (21.4 | ) |  | $ | (19.8 | )
Amortization of net actuarial loss 1 |  |  | — |  |  |  | 0.1 |  |  |  | — |  |  |  | 0.3 |
Amortization of prior service cost 1 |  |  | 1.2 |  |  |  | 0.9 |  |  |  | 3.7 |  |  |  | 2.6 |
Less: income tax expense 2 |  |  | (0.2 | ) |  |  | (0.2 | ) |  |  | (0.9 | ) |  |  | (0.7 | )
Other comprehensive income, net of tax |  |  | 1.0 |  |  |  | 0.8 |  |  |  | 2.8 |  |  |  | 2.2 |
Ending balance |  | $ | (18.6 | ) |  | $ | (17.6 | ) |  | $ | (18.6 | ) |  | $ | (17.6 | )
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | (1.7 | ) |  | $ | 24.8 |  |  | $ | 17.7 |  |  | $ | 1.1 |
Unrealized (loss) gain on cash flow hedges |  |  | (9.8 | ) |  |  | 29.8 |  |  |  | (18.2 | ) |  |  | 72.1 |
Less: income tax benefit (expense) |  |  | 2.2 |  |  |  | (7.0 | ) |  |  | 4.2 |  |  |  | (17.0 | )
Net unrealized (loss) gain on cash flow hedges |  |  | (7.6 | ) |  |  | 22.8 |  |  |  | (14.0 | ) |  |  | 55.1 |
Reclassification of unrealized loss (gain) upon settlement of cash flow hedges |  |  | 8.1 |  |  |  | (16.7 | ) |  |  | (8.9 | ) |  |  | (28.1 | )
Less: income tax (expense) benefit 2 |  |  | (1.9 | ) |  |  | 3.9 |  |  |  | 2.1 |  |  |  | 6.7 |
Net loss (gain) reclassified from AOCI to Net income (loss) |  |  | 6.2 |  |  |  | (12.8 | ) |  |  | (6.8 | ) |  |  | (21.4 | )
Other comprehensive (loss) income, net of tax |  |  | (1.4 | ) |  |  | 10.0 |  |  |  | (20.8 | ) |  |  | 33.7 |
Ending balance 3 |  | $ | (3.1 | ) |  | $ | 34.8 |  |  | $ | (3.1 | ) |  | $ | 34.8 |
Foreign Currency Translation: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | — |  |  | $ | (0.1 | ) |  | $ | — |  |  | $ | — |
Other comprehensive income (loss), net of tax |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (0.1 | )
Ending balance |  | $ | — |  |  | $ | (0.1 | ) |  | $ | — |  |  | $ | (0.1 | )
Total AOCI ending balance |  | $ | (21.7 | ) |  | $ | 17.1 |  |  | $ | (21.7 | ) |  | $ | 17.1 |
1 Amounts amortized out of AOCI relating to Salaried VEBA adjustments were included within Other income (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 September 30, 2022, we estimate a net mark-to-market loss before tax of $7.6 million in AOCI will be reclassified into Net income (loss) upon settlement within the next 12 months.

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