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Retirement Plans (Tables)
9 Months Ended
Jun. 30, 2023
Retirement Benefits [Abstract]  
Schedule of Net Periodic Pension and Postretirement Cost (Benefit) The Company’s net periodic pension and postretirement costs (income) for its material plans were as follows:
Three Months Ended
June 30,
Nine Months Ended
June 30,
 2023202220232022
Service cost$0.5 $0.9 $1.4 $2.9 
Interest cost5.3 2.6 15.9 7.8 
Expected return on plan assets(5.4)(5.3)(16.3)(15.9)
Recognized net actuarial loss0.4 1.5 1.2 4.6 
Defined benefit settlement loss— — 7.2 — 
Net periodic cost (income)$0.8 $(0.3)$9.4 $(0.6)