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Retirement Plans (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation, pension plans $ 439.0 $ 398.1  
Percent of total pension plan assets - U.S. 69.00%    
Defined contribution plan, company match percentage 100.00%    
Defined contribution plan, company match, percentage of employees pay 6.00%    
Defined contribution plan, cost recognized $ 11.3 $ 11.3 $ 10.4
Expected defined benefit plan contributions, fiscal 2025 6.5    
Expected defined benefit plan contributions, fiscal 2026 7.0    
Expected defined benefit plan contributions, fiscal 2027 5.0    
Expected defined benefit plan contributions, fiscal 2028 4.5    
Expected defined benefit plan contributions, fiscal 2029 $ 4.2    
Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Broad target allocations 44.00%    
Debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Broad target allocations 56.00%    
Common stock      
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan, amount of employer securities included in plan assets $ 0.0