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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Sep. 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 September 30, |  |  | Nine Months Ended September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Defined Benefit Plans: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | (1.1 | ) |  | $ | (19.6 | ) |  | $ | 2.8 |  |  | $ | (21.4 | )
Actuarial loss arising during the period |  |  | — |  |  |  | — |  |  |  | (0.6 | ) |  |  | — |
Less: income tax benefit |  |  | — |  |  |  | — |  |  |  | 0.1 |  |  |  | — |
Net actuarial loss arising during the period |  |  | — |  |  |  | — |  |  |  | (0.5 | ) |  |  | — |
Prior service cost arising during the period |  |  | — |  |  |  | — |  |  |  | (6.6 | ) |  |  | — |
Less: income tax benefit |  |  | — |  |  |  | — |  |  |  | 1.6 |  |  |  | — |
Net prior service cost arising during the period |  |  | — |  |  |  | — |  |  |  | (5.0 | ) |  |  | — |
Amortization of net actuarial gain 1 |  |  | (0.3 | ) |  |  | — |  |  |  | (0.9 | ) |  |  | — |
Amortization of prior service cost 1 |  |  | 1.4 |  |  |  | 1.2 |  |  |  | 4.0 |  |  |  | 3.7 |
Less: income tax expense 2 |  |  | (0.3 | ) |  |  | (0.2 | ) |  |  | (0.7 | ) |  |  | (0.9 | )
Net amortization reclassified from AOCI to Net income (loss) |  |  | 0.8 |  |  |  | 1.0 |  |  |  | 2.4 |  |  |  | 2.8 |
Other comprehensive income (loss), net of tax |  |  | 0.8 |  |  |  | 1.0 |  |  |  | (3.1 | ) |  |  | 2.8 |
Ending balance |  | $ | (0.3 | ) |  | $ | (18.6 | ) |  | $ | (0.3 | ) |  | $ | (18.6 | )
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | (4.1 | ) |  | $ | (1.7 | ) |  | $ | 0.4 |  |  | $ | 17.7 |
Unrealized gain (loss) on cash flow hedges |  |  | 2.4 |  |  |  | (9.8 | ) |  |  | (9.2 | ) |  |  | (18.2 | )
Less: income tax (expense) benefit |  |  | (0.6 | ) |  |  | 2.2 |  |  |  | 2.1 |  |  |  | 4.2 |
Net unrealized gain (loss) on cash flow hedges |  |  | 1.8 |  |  |  | (7.6 | ) |  |  | (7.1 | ) |  |  | (14.0 | )
Reclassification of unrealized loss (gain) upon settlement of cash flow hedges |  |  | 4.5 |  |  |  | 8.1 |  |  |  | 10.2 |  |  |  | (8.9 | )
Less: income tax (expense) benefit 2 |  |  | (1.1 | ) |  |  | (1.9 | ) |  |  | (2.4 | ) |  |  | 2.1 |
Net loss (gain) reclassified from AOCI to Net income (loss) |  |  | 3.4 |  |  |  | 6.2 |  |  |  | 7.8 |  |  |  | (6.8 | )
Other comprehensive income (loss), net of tax |  |  | 5.2 |  |  |  | (1.4 | ) |  |  | 0.7 |  |  |  | (20.8 | )
Ending balance 3 |  | $ | 1.1 |  |  | $ | (3.1 | ) |  | $ | 1.1 |  |  | $ | (3.1 | )
Total AOCI ending balance |  | $ | 0.8 |  |  | $ | (21.7 | ) |  | $ | 0.8 |  |  | $ | (21.7 | )
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. 3 As of September 30, 2023, we estimate a net mark-to-market gain before tax of $1.0 million in AOCI will be reclassified into Net income (loss) upon settlement within the next 12 months.

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