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Retirement Plans | 3 Months Ended
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Mar. 31, 2024
Retirement Benefits [Abstract] |
Retirement Plans | (10) Retirement Plans The components of the net periodic benefit cost (credit) for our plans were as follows:
|  | Three Months Ended March 31, |
|  | Defined Benefit Pension Plans |  |  | Retiree Health Care Plan |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Service cost |  | $ | 4.1 |  |  | $ | 3.8 |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 4.8 |  |  |  | 5.2 |  |  |  | 0.1 |  |  |  | 0.1 |
Expected return on assets |  |  | (4.7 | ) |  |  | (4.6 | ) |  |  | — |  |  |  | — |
Net gain |  |  | (0.4 | ) |  |  | (0.9 | ) |  |  | — |  |  |  | — |
Prior service cost (credit) |  |  | 0.2 |  |  |  | 0.2 |  |  |  | (0.2 | ) |  |  | (0.2 | )
Total benefit cost (credit) |  | $ | 4.0 |  |  | $ | 3.7 |  |  | $ | (0.1 | ) |  | $ | (0.1 | )
C ontributions made to our pension plans and retiree health plan were $5.2 and $0.3, respectively, in both the three months ended March 31, 2024 and 2023. During 2024, we expect to make total contributions of approximately $20.0 to our pension plans and to fund our retiree health care payments as incurred.

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