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Retirement Plans | 9 Months Ended
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Jun. 30, 2024
Retirement Benefits [Abstract] |
Retirement Plans | Retirement Plan We have a defined benefit plan (“Pension Plan”) that we fund in accordance with its requirements in amounts sufficient to satisfy the minimum funding requirements of applicable laws. The Pension Plan provides benefits based on years of service and compensation or at stated amounts for each year of service with an annual measurement date of September 30. The components of net periodic cost for our Pension Plan are presented below:
| Three months ended |  | Nine months ended
| June 30, |  | June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
| (in millions)
Service cost | $ | 0.2 |  |  | $ | 0.2 |  |  | $ | 0.5 |  |  | $ | 0.6 |
Pension expense other than service: |  |  |  |  |  |  |
Interest cost | 3.5 |  |  | 3.4 |  |  | 10.5 |  |  | 10.4 |
Expected return on plan assets | (3.3) |  |  | (3.5) |  |  | (9.9) |  |  | (10.4) |
Amortization of actuarial net loss | 0.8 |  |  | 1.0 |  |  | 2.4 |  |  | 2.8 |
Pension expense other than service | 1.0 |  |  | 0.9 |  |  | 3.0 |  |  | 2.8 |
Net periodic cost | $ | 1.2 |  |  | $ | 1.1 |  |  | $ | 3.5 |  |  | $ | 3.4 |
The amortization of actuarial losses, net of income tax, is recorded as a component of Other comprehensive income. For each of the three months ended June 30, 2024 and 2023, the amortization of actuarial net loss is shown net of income tax of $0.2 million in the condensed consolidated statements of comprehensive income. For the nine months ended June 30, 2024 and 2023, the amortization of actuarial loss is shown net of income tax of $0.6 million and $0.8 million respectively, in the condensed consolidated statements of comprehensive income.

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