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Retirement Plans
 3 Months Ended
Dec. 31, 2022
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,
 20222021
 (in millions)
Service cost$0.2 $0.3 
Pension costs (benefits) other than service:
Interest cost3.5 2.4 
Expected return on plan assets(3.5)(3.8)
Amortization of actuarial net loss0.9 0.4 
Pension costs (benefits) other than service0.9 (1.0)
Net periodic costs (benefits)$1.1 $(0.7)

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