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Accumulated Other Comprehensive Income (Loss) | 6 Months Ended
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Jun. 30, 2024
Equity [Abstract] |
Accumulated Other Comprehensive Income (Loss) | 8. 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, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Defined Benefit Plans: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | 10.5 |  |  | $ | 3.5 |  |  | $ | 11.0 |  |  | $ | 2.8 |
Actuarial gain (loss) arising during the period |  |  | 1.4 |  |  |  | (0.6 | ) |  |  | 1.4 |  |  |  | (0.6 | )
Less: income tax (expense) benefit |  |  | (0.3 | ) |  |  | 0.1 |  |  |  | (0.3 | ) |  |  | 0.1 |
Net actuarial gain (loss) arising during the period |  |  | 1.1 |  |  |  | (0.5 | ) |  |  | 1.1 |  |  |  | (0.5 | )
Prior service cost arising during the period |  |  | (2.2 | ) |  |  | (6.6 | ) |  |  | (2.2 | ) |  |  | (6.6 | )
Less: income tax benefit |  |  | 0.5 |  |  |  | 1.6 |  |  |  | 0.5 |  |  |  | 1.6 |
Net prior service cost arising during the period |  |  | (1.7 | ) |  |  | (5.0 | ) |  |  | (1.7 | ) |  |  | (5.0 | )
Amortization of net actuarial gain 1 |  |  | (0.2 | ) |  |  | (0.3 | ) |  |  | (0.5 | ) |  |  | (0.6 | )
Amortization of prior service cost 1 |  |  | 0.8 |  |  |  | 1.4 |  |  |  | 0.5 |  |  |  | 2.6 |
Less: income tax expense 2 |  |  | (0.1 | ) |  |  | (0.2 | ) |  |  | — |  |  |  | (0.4 | )
Net amortization reclassified from AOCI to Net income |  |  | 0.5 |  |  |  | 0.9 |  |  |  | — |  |  |  | 1.6 |
Other comprehensive loss, net of tax |  |  | (0.1 | ) |  |  | (4.6 | ) |  |  | (0.6 | ) |  |  | (3.9 | )
Ending balance |  | $ | 10.4 |  |  | $ | (1.1 | ) |  | $ | 10.4 |  |  | $ | (1.1 | )
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | 0.5 |  |  | $ | (1.4 | ) |  | $ | 2.1 |  |  | $ | 0.4 |
Unrealized gain (loss) on cash flow hedges |  |  | 6.1 |  |  |  | (9.0 | ) |  |  | 1.9 |  |  |  | (11.6 | )
Less: income tax (expense) benefit |  |  | (1.4 | ) |  |  | 2.1 |  |  |  | (0.4 | ) |  |  | 2.7 |
Net unrealized gain (loss) on cash flow hedges |  |  | 4.7 |  |  |  | (6.9 | ) |  |  | 1.5 |  |  |  | (8.9 | )
Reclassification of unrealized (gain) loss upon settlement of cash flow hedges |  |  | (2.0 | ) |  |  | 5.5 |  |  |  | 0.1 |  |  |  | 5.7 |
Reclassification due to forecasted transactions probable of not occurring |  |  | 0.2 |  |  |  | — |  |  |  | 0.2 |  |  |  | — |
Less: income tax benefit (expense)2 |  |  | 0.4 |  |  |  | (1.3 | ) |  |  | (0.1 | ) |  |  | (1.3 | )
Net (gain) loss reclassified from AOCI to Net income |  |  | (1.4 | ) |  |  | 4.2 |  |  |  | 0.2 |  |  |  | 4.4 |
Other comprehensive income (loss), net of tax |  |  | 3.3 |  |  |  | (2.7 | ) |  |  | 1.7 |  |  |  | (4.5 | )
Ending balance 3 |  | $ | 3.8 |  |  | $ | (4.1 | ) |  | $ | 3.8 |  |  | $ | (4.1 | )
Total AOCI ending balance |  | $ | 14.2 |  |  | $ | (5.2 | ) |  | $ | 14.2 |  |  | $ | (5.2 | )
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 June 30, 2024, we estimate a net mark-to-market gain before tax of $3.9 million in AOCI will be reclassified into Net income upon settlement within the next 12 months.

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