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Accumulated Other Comprehensive (Loss) Income (Tables) | 6 Months Ended
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Jun. 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 June 30, |  |  | Six Months Ended June 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Defined Benefit Pension Plan and Salaried VEBA: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | (20.5 | ) |  | $ | (19.1 | ) |  | $ | (21.4 | ) |  | $ | (19.8 | )
Amortization of net actuarial loss1 |  |  | — |  |  |  | 0.1 |  |  |  | — |  |  |  | 0.2 |
Amortization of prior service cost1 |  |  | 1.3 |  |  |  | 0.8 |  |  |  | 2.5 |  |  |  | 1.7 |
Less: income tax expense2 |  |  | (0.4 | ) |  |  | (0.2 | ) |  |  | (0.7 | ) |  |  | (0.5 | )
Other comprehensive income, net of tax |  |  | 0.9 |  |  |  | 0.7 |  |  |  | 1.8 |  |  |  | 1.4 |
Ending balance |  | $ | (19.6 | ) |  | $ | (18.4 | ) |  | $ | (19.6 | ) |  | $ | (18.4 | )
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | 34.8 |  |  | $ | 9.6 |  |  | $ | 17.7 |  |  | $ | 1.1 |
Unrealized (loss) gain on cash flow hedges |  |  | (50.7 | ) |  |  | 28.4 |  |  |  | (8.4 | ) |  |  | 42.3 |
Less: income tax benefit (expense) |  |  | 12.0 |  |  |  | (6.7 | ) |  |  | 2.0 |  |  |  | (10.0 | )
Net unrealized (loss) gain on cash flow hedges |  |  | (38.7 | ) |  |  | 21.7 |  |  |  | (6.4 | ) |  |  | 32.3 |
Reclassification of unrealized loss (gain) upon settlement of cash flow hedges |  |  | 2.9 |  |  |  | (8.7 | ) |  |  | (17.0 | ) |  |  | (11.4 | )
Less: income tax (expense) benefit2 |  |  | (0.7 | ) |  |  | 2.2 |  |  |  | 4.0 |  |  |  | 2.8 |
Net loss (gain) reclassified from AOCI to Net loss |  |  | 2.2 |  |  |  | (6.5 | ) |  |  | (13.0 | ) |  |  | (8.6 | )
Other comprehensive (loss) income, net of tax |  |  | (36.5 | ) |  |  | 15.2 |  |  |  | (19.4 | ) |  |  | 23.7 |
Ending balance3 |  | $ | (1.7 | ) |  | $ | 24.8 |  |  | $ | (1.7 | ) |  | $ | 24.8 |
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 |  | $ | (21.3 | ) |  | $ | 6.3 |  |  | $ | (21.3 | ) |  | $ | 6.3 |
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 benefit. 3 As of June 30, 2022, we estimate a net mark-to-market loss before tax of $6.0 million in AOCI will be reclassified into Net loss upon settlement within the next 12 months.

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