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Employee Benefits Plans | 9 Months Ended
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Sep. 30, 2024
Retirement Benefits [Abstract] |
Employee Benefit Plans | (10) Employe e Benefit Plans Components of Net Periodic Expense The components of net periodic expense were as follows:
| Defined Benefit Pension Plan |  | Supplemental Non-qualified Defined Benefit Plans |  | Non-pension Defined Benefit Postretirement Healthcare Plan |
Three Months Ended September 30, | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023 |
| (in millions) |
Service cost | $ | 0.6 |  | $ | 0.6 |  | $ | 1.3 |  | $ | (0.1 | ) | $ | 0.4 |  | $ | 0.4 |
Interest cost |  | 4.1 |  |  | 4.4 |  |  | 0.4 |  |  | 0.4 |  |  | 0.6 |  |  | 0.6 |
Expected return on plan assets |  | (4.5 | ) |  | (4.7 | ) |  | - |  |  | - |  |  | (0.1 | ) |  | (0.1 | )
Net amortization of prior service costs |  | - |  |  | - |  |  | - |  |  | - |  |  | 0.1 |  |  | - |
Recognized net actuarial loss |  | 0.5 |  |  | 0.5 |  |  | - |  |  | - |  |  | - |  |  | - |
Net periodic expense | $ | 0.7 |  | $ | 0.8 |  | $ | 1.7 |  | $ | 0.3 |  | $ | 1.0 |  | $ | 0.9 |
| Defined Benefit Pension Plan |  | Supplemental Non-qualified Defined Benefit Plans |  | Non-pension Defined Benefit Postretirement Healthcare Plan |
Nine Months Ended September 30, | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023 |
| (in millions) |
Service cost | $ | 1.7 |  | $ | 1.8 |  | $ | 2.9 |  | $ | 1.6 |  | $ | 1.2 |  | $ | 1.1 |
Interest cost |  | 12.3 |  |  | 13.1 |  |  | 1.1 |  |  | 1.1 |  |  | 1.8 |  |  | 1.8 |
Expected return on plan assets |  | (13.4 | ) |  | (14.0 | ) |  | - |  |  | - |  |  | (0.2 | ) |  | (0.1 | )
Net amortization of prior service costs |  | (0.1 | ) |  | - |  |  | - |  |  | - |  |  | 0.1 |  |  | - |
Recognized net actuarial loss |  | 1.5 |  |  | 1.5 |  |  | - |  |  | - |  |  | - |  |  | - |
Net periodic expense | $ | 2.0 |  | $ | 2.4 |  | $ | 4.0 |  | $ | 2.7 |  | $ | 2.9 |  | $ | 2.8 |
Plan Contributions Contributions to the Defined Benefit Pension Plan are cash contributions made directly to the Pension Plan Trust account. Contributions to the Postretirement Healthcare and Supplemental Plans are primarily made in the form of benefit payments. Contributions made in the first nine months of 2024 and anticipated contributions for 2024 and 2025 are as follows:
| Contributions Made |  | Additional Contributions |  | Contributions |
| Nine Months Ended September 30, 2024 |  | Anticipated for 2024 |  | Anticipated for 2025 |
| (in millions) |
Defined Benefit Pension Plan | $ | 2.3 |  | $ | - |  | $ | 1.8 |
Non-pension Defined Benefit Postretirement Healthcare Plan | $ | 3.5 |  | $ | 1.2 |  | $ | 4.4 |
Supplemental Non-qualified Defined Benefit and Defined Contribution Plans | $ | 1.8 |  | $ | 0.6 |  | $ | 2.8 |

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