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Components of Net Periodic Benefit Cost | 6 Months Ended
--- | ---
Jun. 30, 2024
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Cost | Components of Net Periodic Benefit Cost
|  | Pension Benefits
|  | Three months ended June 30, |  | Six months ended June 30,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
Service cost |  | $ | 0.7 |  |  | $ | 0.1 |  |  | $ | 1.3 |  |  | $ | 1.1 |
Interest cost |  | 3.2 |  |  | 4.4 |  |  | 6.7 |  |  | 7.0 |
Expected return on plan assets |  | (4.1) |  |  | (1.7) |  |  | (7.9) |  |  | (7.5) |
Amortization of prior service costs |  | — |  |  | — |  |  | 0.1 |  |  | 0.1 |
Amortization of net loss |  | 1.3 |  |  | 2.4 |  |  | 3.0 |  |  | 3.2 |
Net periodic benefit cost (income) |  | $ | 1.1 |  |  | $ | 5.2 |  |  | $ | 3.2 |  |  | $ | 3.9 |
|  | Other Postretirement Benefits
|  | Three months ended June 30, |  | Six months ended June 30,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
Service cost |  | $ | 0.1 |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | 0.1 |
Interest cost |  | 0.9 |  |  | 1.2 |  |  | 1.9 |  |  | 1.9 |
Amortization of prior service cost |  | (0.1) |  |  | — |  |  | (0.1) |  |  | — |
Amortization of net loss |  | 0.3 |  |  | (0.2) |  |  | 0.3 |  |  | 0.1 |
Net periodic benefit cost |  | $ | 1.2 |  |  | $ | 1.0 |  |  | $ | 2.2 |  |  | $ | 2.1 |

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