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Pension Plans | 3 Months Ended
--- | ---
Mar. 31, 2024
Retirement Benefits [Abstract] |
Pension Plans | Pension Plans
| First Quarter |  |
| 2024 |  | 2023 |  |  |  |
Service cost — benefits earned during the period (in millions) | $ | 1.5 |  |  | $ | 1.5 |  |  |  |  |
Pension non-service cost (income) (in millions): |  |  |  |  |  |  |
Interest cost on benefit obligation | $ | 8.2 |  |  | $ | 8.4 |  |  |  |  |
Expected return on plan assets | (13.6) |  |  | (13.6) |  |  |  |  |
Amortization of net prior service cost (income) | (0.2) |  |  | (0.5) |  |  |  |  |
Amortization of net actuarial loss (gain) | 2.9 |  |  | 2.4 |  |  |  |  |
Pension non-service cost (income) | $ | (2.7) |  |  | $ | (3.3) |  |  |  |  |

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