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Pension and Postretirement Health and Life Benefits (Tables) | 9 Months Ended
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Sep. 30, 2025
Retirement Benefits, Description [Abstract] |
Schedule of Net Benefit Costs | The components of net periodic benefit costs (credits) for the defined benefit pension plans were as follows (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Service costs | $ | 0.1 |  |  | $ | 0.5 |  |  | $ | 0.3 |  |  | $ | 1.5 |
Interest costs | 0.4 |  |  | 0.2 |  |  | 1.2 |  |  | 7.8 |
Amortization of prior service costs (credits), net | — |  |  | 0.1 |  |  | (0.1) |  |  | — |
Remeasurement gain | — |  |  | (0.2) |  |  | — |  |  | (16.8) |
Expected return on plan assets (gains) | (0.5) |  |  | (0.2) |  |  | (1.4) |  |  | (9.5) |
Net periodic benefit costs (credits) | $ | — |  |  | $ | 0.4 |  |  | $ | — |  |  | $ | (17.0) |
The components of net periodic benefit costs for the postretirement health and life benefit plan were as follows (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Interest costs | $ | 1.2 |  |  | $ | 1.2 |  |  | $ | 3.4 |  |  | $ | 3.4 |
Amortization of prior service costs (credits), net | (0.1) |  |  | (0.1) |  | (0.1) |  |  | (0.1)
Net periodic benefit costs | $ | 1.1 |  |  | $ | 1.1 |  |  | $ | 3.3 |  |  | $ | 3.3 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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