XML 200 R13.htm IDEA: XBRL DOCUMENT v3.23.1
Retirement Plans
 6 Months Ended
Mar. 31, 2023
Retirement Benefits [Abstract]  
Retirement Plans Retirement Plans
The components of net periodic costs (benefits) for our pension plans are presented below.

Three months endedSix months ended
March 31,March 31,
 2023202220232022
 (in millions)
Service cost$0.2 $0.3 $0.4 $0.6 
Pension costs (benefits) other than service:
Interest cost3.5 2.4 7.0 4.8 
Expected return on plan assets(3.4)(3.8)(6.9)(7.6)
Amortization of actuarial net loss0.9 0.4 1.8 0.8 
Pension costs (benefits) other than service1.0 (1.0)1.9 (2.0)
Net periodic costs (benefits)$1.2 $(0.7)$2.3 $(1.4)

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