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Retirement Plans | 6 Months Ended
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Jun. 30, 2025
Retirement Benefits [Abstract] |
Retirement Plans | (10) Retirement Plans The components of the net periodic benefit cost (credit) for our retirement plans were as follows:
|  | Defined Benefit Pension Plan |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Service cost |  | $ | 3.8 |  |  | $ | 4.0 |  |  | $ | 7.4 |  |  | $ | 8.1 |
Interest cost |  |  | 5.0 |  |  |  | 4.8 |  |  |  | 9.7 |  |  |  | 9.6 |
Expected return on assets |  |  | (5.2 | ) |  |  | (4.6 | ) |  |  | (10.0 | ) |  |  | (9.3 | )
Net loss (gain) |  |  | 0.1 |  |  |  | (0.4 | ) |  |  | 0.2 |  |  |  | (0.8 | )
Prior service cost |  |  | 0.2 |  |  |  | 0.1 |  |  |  | 0.3 |  |  |  | 0.3 |
Curtailments |  |  | — |  |  |  | (1.3 | ) |  |  | — |  |  |  | (1.3 | )
Total benefit cost |  | $ | 3.9 |  |  | $ | 2.6 |  |  | $ | 7.6 |  |  | $ | 6.6 |
|  | Retiree Health Care Plan |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Interest cost |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.2 |  |  | $ | 0.2 |
Prior service credit |  |  | (0.2 | ) |  |  | (0.2 | ) |  |  | (0.4 | ) |  |  | (0.4 | )
Total benefit credit |  | $ | (0.1 | ) |  | $ | (0.1 | ) |  | $ | (0.2 | ) |  | $ | (0.2 | )
During the three and six months ended June 30, 2025, contributions made to our pension plans were $6.0 and $11.5, respectively, and contributions made to our retiree health care plan were $0.2 and $0.5, respectively. During 2025, we expect to make total contributions of approximately $23.0 to our pension plans and to fund our retiree health care payments as incurred.

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