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Retirement Plans (Tables)
3 Months Ended
Dec. 31, 2023
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost
The components of net periodic cost for our Pension Plan are presented below:

Three months ended
December 31,
 20232022
 (in millions)
Service cost$0.2 $0.2 
Pension expense other than service:
Interest cost3.5 3.5 
Expected return on plan assets(3.3)(3.5)
Amortization of actuarial net loss0.8 0.9 
Pension expense other than service1.0 0.9 
Net periodic cost$1.2 $1.1