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Retirement Plans (Tables)
6 Months Ended
Mar. 31, 2025
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost
The components of net periodic cost for our Pension Plan are presented below:

Three months endedSix months ended
March 31,March 31,
 2025202420252024
 (in millions)
Service cost$0.1 $0.1 $0.3 $0.3 
Pension (benefit) expense other than service:
Interest cost3.0 3.5 6.0 7.0 
Expected return on plan assets(3.6)(3.3)(7.2)(6.6)
Amortization of actuarial net loss0.5 0.8 1.1 1.6 
Pension (benefit) expense other than service(0.1)1.0 (0.1)2.0 
Net periodic cost$— $1.1 $0.2 $2.3