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Retirement Plans (Tables)
9 Months Ended
Jun. 30, 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 endedNine months ended
June 30,June 30,
 2024202320242023
 (in millions)
Service cost$0.2 $0.2 $0.5 $0.6 
Pension expense other than service:
Interest cost3.5 3.4 10.5 10.4 
Expected return on plan assets(3.3)(3.5)(9.9)(10.4)
Amortization of actuarial net loss0.8 1.0 2.4 2.8 
Pension expense other than service1.0 0.9 3.0 2.8 
Net periodic cost$1.2 $1.1 $3.5 $3.4