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Retirement Plans (Tables)
3 Months Ended
Dec. 31, 2023
Retirement Benefits [Abstract]  
Schedule of Net Periodic Pension and Postretirement Cost (Benefit)
The Company’s net periodic pension and postretirement costs for its material plans were as follows:
Three Months Ended
December 31,
 20232022
Service cost$0.5 $0.5 
Interest cost5.3 5.2 
Expected return on plan assets(4.9)(5.4)
Recognized net actuarial loss0.4 0.4 
Net periodic cost$1.3 $0.7