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v3.23.1

Components of Net Periodic Benefit Cost | 3 Months Ended
--- | ---
Mar. 31, 2023
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Cost | Components of Net Periodic Benefit Cost
| Pension Benefits
| Three months ended March 31, |  |  |  |
| 2023 |  | 2022 |  |  |  |  |  |  |  |
Service cost | $ | 1.1 |  |  | $ | 1.1 |  |  |  |  |  |  |  |  |
Interest cost | 2.6 |  |  | 2.5 |  |  |  |  |  |  |  |  |
Expected return on plan assets | (5.9) |  |  | (5.8) |  |  |  |  |  |  |  |  |
Amortization of prior service costs | 0.0 |  |  | — |  |  |  |  |  |  |  |  |
Amortization of net loss | 0.9 |  |  | 0.7 |  |  |  |  |  |  |  |  |
Net periodic benefit cost (income) | $ | (1.3) |  |  | $ | (1.5) |  |  |  |  |  |  |  |  |
| Other Postretirement Benefits
| Three months ended March 31, |  |  |  |
| 2023 |  | 2022 |  |  |  |  |  |  |  |
Service cost | $ | 0.0 |  |  | $ | 0.1 |  |  |  |  |  |  |  |  |
Interest cost | 0.7 |  |  | 0.7 |  |  |  |  |  |  |  |  |
Amortization of prior service cost | 0.0 |  |  | (0.5) |  |  |  |  |  |  |  |  |
Amortization of net loss | 0.3 |  |  | 0.5 |  |  |  |  |  |  |  |  |
Net periodic benefit cost (income) | $ | 1.0 |  |  | $ | 0.8 |  |  |  |  |  |  |  |  |

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