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Retirement Plans
 9 Months Ended
Jun. 30, 2023
Retirement Benefits [Abstract]  
Retirement Plans Retirement Plans
The components of net periodic costs (benefits) for our pension plans are presented below:

Three months endedNine months ended
June 30,June 30,
 2023202220232022
 (in millions)
Service cost$0.2 $0.3 $0.6 $0.9 
Pension costs (benefits) other than service:
Interest cost3.4 2.5 10.4 7.3 
Expected return on plan assets(3.5)(3.8)(10.4)(11.4)
Amortization of actuarial net loss1.0 0.4 2.8 1.2 
Pension costs (benefits) other than service0.9 (0.9)2.8 (2.9)
Net periodic costs (benefits)$1.1 $(0.6)$3.4 $(2.0)

The amortization of actuarial losses, net of income tax, is recorded as a component of other comprehensive loss. For each of the three months ended June 30, 2023 and 2022, 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, 2023 and 2022, the amortization of actuarial loss is shown net of income tax of $0.8 million and $0.3 million respectively, in the condensed consolidated statements of comprehensive income.