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Retirement Plans
 3 Months Ended
Dec. 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 ended
December 31,
 20212020
 (in millions)
Service cost$0.3 $0.4 
Pension costs (benefits) other than service:
Interest cost2.4 2.5 
Expected return on plan assets(3.8)(3.9)
Amortization of actuarial net loss0.4 0.6 
Pension benefits other than service(1.0)(0.8)
Net periodic benefit$(0.7)$(0.4)

The amortization of actuarial losses, net of tax, is recorded as a component of other comprehensive income (loss).