The following table shows the components of net periodic cost for the three months ended June 30, 2025 and 2024 (in millions): | | | | | | | | | | | | | | | | | | | | | | | |
| 2025
Pension
Benefits | | 2024
Pension
Benefits | | 2025
Retiree
Health and Life | | 2024
Retiree
Health and Life | Service cost | $ | 1.7 | | | $ | 1.6 | | | $ | 0.1 | | | $ | 0.1 | | Interest cost | 4.3 | | | 4.2 | | | 0.1 | | | 0.1 | | Expected return on plan assets | (5.4) | | | (5.4) | | | — | | | — | | | | | | | | | | Amortization of (1): | | | | | | | | Unrecognized prior service credit | — | | | — | | | — | | | — | | Unrecognized net actuarial loss (gain) | 0.2 | | | 0.3 | | | — | | | (0.2) | | Net periodic cost | $ | 0.8 | | | $ | 0.7 | | | $ | 0.2 | | | $ | — | |
The following table shows the components of net periodic cost for the six months ended June 30, 2025 and 2024 (in millions): | | | | | | | | | | | | | | | | | | | | | | | |
| 2025
Pension
Benefits | | 2024
Pension
Benefits | | 2025
Retiree
Health and Life | | 2024
Retiree
Health and Life | Service cost | $ | 3.1 | | | $ | 3.0 | | | $ | 0.1 | | | $ | 0.1 | | Interest cost | 8.5 | | | 8.2 | | | 0.3 | | | 0.3 | | Expected return on plan assets | (10.9) | | | (10.8) | | | — | | | — | | | | | | | | | | Amortization of (1): | | | | | | | | Unrecognized prior service credit | — | | | — | | | — | | | (0.1) | | Unrecognized net actuarial loss (gain) | 0.4 | | | 0.5 | | | (0.2) | | | (0.3) | | Net periodic cost | $ | 1.1 | | | $ | 0.9 | | | $ | 0.2 | | | $ | — | |
_________ (1) Amounts reclassified from accumulated other comprehensive loss.
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