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v3.25.1

Accumulated Other Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2025
Equity [Abstract] |
Schedule of 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 March 31, |
|  | 2025 |  |  | 2024 |
Defined Benefit Plans: |  |  |  |  |  |
Beginning balance |  | $ | 19.1 |  |  | $ | 11.0 |
Actuarial loss arising during the period |  |  | (0.1 | ) |  |  | — |
Amortization of net actuarial gain 1 |  |  | (0.6 | ) |  |  | (0.3 | )
Amortization of prior service cost (credit)1 |  |  | 0.9 |  |  |  | (0.3 | )
Less: income tax (expense) benefit 2 |  |  | (0.1 | ) |  |  | 0.1 |
Other comprehensive income (loss), net of tax |  |  | 0.1 |  |  |  | (0.5 | )
Ending balance |  | $ | 19.2 |  |  | $ | 10.5 |
Cash Flow Hedges: |  |  |  |  |  |
Beginning balance |  | $ | 1.4 |  |  | $ | 2.1 |
Unrealized gain (loss) on cash flow hedges |  |  | 8.7 |  |  |  | (4.2 | )
Less: income tax (expense) benefit |  |  | (2.0 | ) |  |  | 1.0 |
Net unrealized gain (loss) on cash flow hedges |  |  | 6.7 |  |  |  | (3.2 | )
Reclassification of unrealized (gain) loss upon settlement of cash flow hedges |  |  | (5.5 | ) |  |  | 2.1 |
Less: income tax benefit (expense)2 |  |  | 1.3 |  |  |  | (0.5 | )
Net (gain) loss reclassified from AOCI to Net income |  |  | (4.2 | ) |  |  | 1.6 |
Other comprehensive income (loss), net of tax |  |  | 2.5 |  |  |  | (1.6 | )
Ending balance 3 |  | $ | 3.9 |  |  | $ | 0.5 |
Total AOCI ending balance |  | $ | 23.1 |  |  | $ | 11.0 |
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 March 31, 2025, we estimate a net mark-to-market gain before tax of $4.4 million in AOCI will be reclassified into Net income upon settlement within the next 12 months.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-20 + Details
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