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Pension and Other Post-Retirement Benefits | 9 Months Ended
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Sep. 30, 2025
Retirement Benefits [Abstract] |
Pension and Other Post-Retirement Benefits | Pension and Other Post-Retirement Benefits The following table shows the components of net periodic cost for the three months ended September 30, 2025 and 2024 (in millions):
| 2025 Pension Benefits |  | 2024 Pension Benefits |  | 2025 Retiree Health and Life |  | 2024 Retiree Health and Life
Service cost | $ | 1.5 |  |  | $ | 1.6 |  |  | $ | — |  |  | $ | — |
Interest cost | 4.1 |  |  | 4.1 |  |  | 0.2 |  |  | 0.2 |
Expected return on plan assets | (5.4) |  |  | (5.4) |  |  | — |  |  | — |
Amortization of (1): |  |  |  |  |  |  |
Unrecognized prior service credit | — |  |  | — |  |  | — |  |  | (0.1) |
Unrecognized net actuarial loss (gain) | 0.3 |  |  | 0.3 |  |  | (0.2) |  |  | (0.1) |
Net periodic cost | $ | 0.5 |  |  | $ | 0.6 |  |  | $ | — |  |  | $ | — |
The following table shows the components of net periodic cost for the nine months ended September 30, 2025 and 2024 (in millions):
| 2025 Pension Benefits |  | 2024 Pension Benefits |  | 2025 Retiree Health and Life |  | 2024 Retiree Health and Life
Service cost | $ | 4.6 |  |  | $ | 4.6 |  |  | $ | 0.1 |  |  | $ | 0.1 |
Interest cost | 12.6 |  |  | 12.3 |  |  | 0.5 |  |  | 0.5 |
Expected return on plan assets | (16.3) |  |  | (16.2) |  |  | — |  |  | — |
Amortization of (1): |  |  |  |  |  |  |
Unrecognized prior service credit | — |  |  | — |  |  | — |  |  | (0.2) |
Unrecognized net actuarial loss (gain) | 0.7 |  |  | 0.8 |  |  | (0.4) |  |  | (0.4) |
Net periodic cost | $ | 1.6 |  |  | $ | 1.5 |  |  | $ | 0.2 |  |  | $ | — |
_________ (1) Amounts reclassified from accumulated other comprehensive loss. The service cost component of net periodic cost was $1.5 million and $4.7 million for the three and nine months ended September 30, 2025, and $1.6 million and $4.7 million for the three and nine months ended September 30, 2024 and is recorded in selling, general and administrative expense. The non-service components totaled income of $1.0 million and $2.9 million for the three and nine months ended September 30, 2025 and $1.0 million and $3.2 million for the three and nine months ended September 30, 2024, and are recorded in other income (expense) in the statements of comprehensive income.

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