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Retirement Plans (Tables)
3 Months Ended
Dec. 31, 2024
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,
 20242023
 (in millions)
Service cost$0.2 $0.2 
Pension expense other than service:
Interest cost3.0 3.5 
Expected return on plan assets(3.6)(3.3)
Amortization of actuarial net loss0.6 0.8 
Pension expense other than service— 1.0 
Net periodic cost$0.2 $1.2