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Retirement Benefits | 9 Months Ended
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Jun. 30, 2024
Retirement Benefits [Abstract] |
Retirement Benefits | Retirement Benefits The components of net periodic pension and postretirement benefit cost were (in millions):
| Pension Benefits
| Three Months Ended June 30, |  | Nine Months Ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Service cost | $ | 9.3 |  |  | $ | 9.4 |  |  | $ | 27.8 |  |  | $ | 30.6 |
Interest cost | 36.6 |  |  | 35.3 |  |  | 109.9 |  |  | 114.0 |
Expected return on plan assets | (42.2) |  |  | (44.0) |  |  | (126.9) |  |  | (147.0) |
Amortization of prior service cost | — |  |  | 0.1 |  |  | — |  |  | 0.1 |
Amortization of net actuarial (gain) loss | (0.3) |  |  | 0.2 |  |  | (0.8) |  |  | (1.8) |
Settlement charge | — |  |  | 2.2 |  |  | — |  |  | 120.1 |
Net periodic pension benefit cost | $ | 3.4 |  |  | $ | 3.2 |  |  | $ | 10.0 |  |  | $ | 116.0 |
| Other Postretirement Benefits
| Three Months Ended June 30, |  | Nine Months Ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Service cost | $ | 0.1 |  |  | $ | 0.2 |  |  | $ | 0.4 |  |  | $ | 0.4 |
Interest cost | 0.6 |  |  | 0.6 |  |  | 1.9 |  |  | 1.7 |
Amortization of net actuarial loss | 0.4 |  |  | 0.1 |  |  | 1.2 |  |  | 0.4 |
Net periodic postretirement benefit cost | $ | 1.1 |  |  | $ | 0.9 |  |  | $ | 3.5 |  |  | $ | 2.5 |
The service cost component is included in Cost of sales and Selling, general and administrative expenses in the Consolidated Statement of Operations. All other components are included in Other income (expense) in the Consolidated Statement of Operations.

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