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Retirement Plans
 6 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Retirement Plans Retirement Plans
The components of net periodic benefit cost for our pension plans are presented below.
Three months endedSix months ended
March 31,March 31,
 2021202020212020
 (in millions)
Service cost$0.4 $0.4 $0.8 $0.8 
Pension costs (benefits) other than service:
Interest cost2.5 2.8 5.0 5.6 
Expected return on plan assets(3.9)(4.2)(7.8)(8.4)
Amortization of actuarial net loss0.6 0.6 1.2 1.3 
Pension benefits other than service(0.8)(0.8)(1.6)(1.5)
Net periodic benefit$(0.4)$(0.4)$(0.8)$(0.7)
The amortization of actuarial losses, net of tax, is recorded as a component of other comprehensive loss.