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Retirement Plans
 9 Months Ended
Jun. 30, 2025
Retirement Benefits [Abstract]  
Retirement Plans Retirement Plan
We have a defined benefit plan (“Pension Plan”) that we fund in accordance with its requirements and, where applicable, 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 endedNine months ended
June 30,June 30,
 2025202420252024
 (in millions)
Service cost$0.2 $0.2 $0.5 $0.5 
Pension expense (benefit) other than service:
Interest cost3.0 3.5 9.0 10.5 
Expected return on plan assets(3.6)(3.3)(10.8)(9.9)
Amortization of actuarial net loss0.6 0.8 1.7 2.4 
Pension expense (benefit) other than service— 1.0 (0.1)3.0 
Net periodic cost$0.2 $1.2 $0.4 $3.5 
The amortization of actuarial losses, net of income tax, is recorded as a component of Other comprehensive income. For the three months ended June 30, 2025 and 2024, the amortization of actuarial net loss is shown net of income tax of $0.1 million and $0.2 million, respectively, in the condensed consolidated statements of comprehensive income. For the nine months ended June 30, 2025 and 2024, the amortization of actuarial loss is shown net of income tax of $0.4 million and $0.6 million, respectively, in the condensed consolidated statements of comprehensive income.