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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 2023
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive 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, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Defined Benefit Plans: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | 3.5 |  |  | $ | (20.5 | ) |  | $ | 2.8 |  |  | $ | (21.4 | )
Actuarial (loss) gain arising during the period |  |  | (0.6 | ) |  |  | — |  |  |  | (0.6 | ) |  |  | — |
Less: income tax benefit |  |  | 0.1 |  |  |  | — |  |  |  | 0.1 |  |  |  | — |
Net actuarial (loss) gain arising during the period |  |  | (0.5 | ) |  |  | — |  |  |  | (0.5 | ) |  |  | — |
Prior service cost arising during the period |  |  | (6.6 | ) |  |  | — |  |  |  | (6.6 | ) |  |  | — |
Less: income tax benefit |  |  | 1.6 |  |  |  | — |  |  |  | 1.6 |  |  |  | — |
Net prior service cost arising during the period |  |  | (5.0 | ) |  |  | — |  |  |  | (5.0 | ) |  |  | — |
Amortization of net actuarial (gain) loss 1 |  |  | (0.3 | ) |  |  | — |  |  |  | (0.6 | ) |  |  | — |
Amortization of prior service cost 1 |  |  | 1.4 |  |  |  | 1.3 |  |  |  | 2.6 |  |  |  | 2.5 |
Less: income tax expense 2 |  |  | (0.2 | ) |  |  | (0.4 | ) |  |  | (0.4 | ) |  |  | (0.7 | )
Net amortization reclassified from AOCI to Net income (loss) |  |  | 0.9 |  |  |  | 0.9 |  |  |  | 1.6 |  |  |  | 1.8 |
Other comprehensive (loss) income, net of tax |  |  | (4.6 | ) |  |  | 0.9 |  |  |  | (3.9 | ) |  |  | 1.8 |
Ending balance |  | $ | (1.1 | ) |  | $ | (19.6 | ) |  | $ | (1.1 | ) |  | $ | (19.6 | )
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | (1.4 | ) |  | $ | 34.8 |  |  | $ | 0.4 |  |  | $ | 17.7 |
Unrealized loss on cash flow hedges |  |  | (9.0 | ) |  |  | (50.7 | ) |  |  | (11.6 | ) |  |  | (8.4 | )
Less: income tax benefit |  |  | 2.1 |  |  |  | 12.0 |  |  |  | 2.7 |  |  |  | 2.0 |
Net unrealized loss on cash flow hedges |  |  | (6.9 | ) |  |  | (38.7 | ) |  |  | (8.9 | ) |  |  | (6.4 | )
Reclassification of unrealized loss (gain) upon settlement of cash flow hedges |  |  | 5.5 |  |  |  | 2.9 |  |  |  | 5.7 |  |  |  | (17.0 | )
Less: income tax (expense) benefit 2 |  |  | (1.3 | ) |  |  | (0.7 | ) |  |  | (1.3 | ) |  |  | 4.0 |
Net loss (gain) reclassified from AOCI to Net income (loss) |  |  | 4.2 |  |  |  | 2.2 |  |  |  | 4.4 |  |  |  | (13.0 | )
Other comprehensive loss, net of tax |  |  | (2.7 | ) |  |  | (36.5 | ) |  |  | (4.5 | ) |  |  | (19.4 | )
Ending balance 3 |  | $ | (4.1 | ) |  | $ | (1.7 | ) |  | $ | (4.1 | ) |  | $ | (1.7 | )
Total AOCI ending balance |  | $ | (5.2 | ) |  | $ | (21.3 | ) |  | $ | (5.2 | ) |  | $ | (21.3 | )
1 Amounts amortized out of AOCI related to pension and other postretirement benefits were included within Net periodic postretirement benefit cost (see Note 3). 2 Income tax amounts reclassified out of AOCI were included as a component of Income tax (provision) benefit. 3 As of June 30, 2023, we estimate a net mark-to-market loss before tax of $6.0 million in AOCI will be reclassified into Net income (loss) upon settlement within the next 12 months.

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