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Accumulated Other Comprehensive Income | 9 Months Ended
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Sep. 30, 2025
Equity [Abstract] |
Accumulated Other Comprehensive Income | 8. Accumulated Other Comprehensive Income 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, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Defined Benefit Plans: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | 19.6 |  |  | $ | 10.4 |  |  | $ | 19.1 |  |  | $ | 11.0 |
Actuarial (loss) gain arising during the period |  |  | — |  |  |  | — |  |  |  | (0.1 | ) |  |  | 1.4 |
Less: income tax expense |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (0.3 | )
Net actuarial (loss) gain arising during the period |  |  | — |  |  |  | — |  |  |  | (0.1 | ) |  |  | 1.1 |
Prior service cost arising during the period |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2.2 | )
Less: income tax benefit |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.5 |
Net prior service cost arising during the period |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1.7 | )
Amortization of net actuarial gain 1 |  |  | (0.7 | ) |  |  | (0.3 | ) |  |  | (1.8 | ) |  |  | (0.8 | )
Amortization of prior service cost 1 |  |  | 1.0 |  |  |  | 1.0 |  |  |  | 2.9 |  |  |  | 1.5 |
Less: income tax expense 2 |  |  | (0.1 | ) |  |  | (0.2 | ) |  |  | (0.3 | ) |  |  | (0.2 | )
Net amortization reclassified from AOCI to Net income |  |  | 0.2 |  |  |  | 0.5 |  |  |  | 0.8 |  |  |  | 0.5 |
Other comprehensive income (loss), net of tax |  |  | 0.2 |  |  |  | 0.5 |  |  |  | 0.7 |  |  |  | (0.1 | )
Ending balance |  | $ | 19.8 |  |  | $ | 10.9 |  |  | $ | 19.8 |  |  | $ | 10.9 |
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | 7.6 |  |  | $ | 3.8 |  |  | $ | 1.4 |  |  | $ | 2.1 |
Unrealized gain on cash flow hedges |  |  | 9.0 |  |  |  | 0.6 |  |  |  | 25.2 |  |  |  | 2.5 |
Less: income tax expense |  |  | (2.1 | ) |  |  | (0.2 | ) |  |  | (5.9 | ) |  |  | (0.6 | )
Net unrealized gain on cash flow hedges |  |  | 6.9 |  |  |  | 0.4 |  |  |  | 19.3 |  |  |  | 1.9 |
Reclassification of unrealized (gain) loss upon settlement of cash flow hedges |  |  | (10.0 | ) |  |  | 1.5 |  |  |  | (18.0 | ) |  |  | 1.6 |
Reclassification due to forecasted transactions probable of not occurring |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.2 |
Less: income tax benefit (expense)2 |  |  | 2.4 |  |  |  | (0.3 | ) |  |  | 4.2 |  |  |  | (0.4 | )
Net (gain) loss reclassified from AOCI to Net income |  |  | (7.6 | ) |  |  | 1.2 |  |  |  | (13.8 | ) |  |  | 1.4 |
Other comprehensive (loss) income, net of tax |  |  | (0.7 | ) |  |  | 1.6 |  |  |  | 5.5 |  |  |  | 3.3 |
Ending balance 3 |  | $ | 6.9 |  |  | $ | 5.4 |  |  | $ | 6.9 |  |  | $ | 5.4 |
Total AOCI ending balance |  | $ | 26.7 |  |  | $ | 16.3 |  |  | $ | 26.7 |  |  | $ | 16.3 |
1. Amounts amortized out of AOCI related to pension and other postretirement and postemployment benefits were included within Net periodic postretirement and postemployment 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, 2025, we estimate a net mark-to-market gain before tax of $8.7 million in AOCI will be reclassified into Net income upon settlement within the next 12 months.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/220/tableOfContent + Details
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