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Retirement Plans (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation, pension plans $ 398.1 $ 433.0  
Percent of total pension plan assets - U.S. 70.00%    
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 $ 10.4 $ 10.4
Expected defined benefit plan contributions, fiscal 2024 7.0    
Expected defined benefit plan contributions, fiscal 2025 9.2    
Expected defined benefit plan contributions, fiscal 2026 10.4    
Expected defined benefit plan contributions, fiscal 2027 10.2    
Expected defined benefit plan contributions, fiscal 2028 $ 10.1    
Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Broad target allocations 41.00%    
Debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Broad target allocations 59.00%    
Common stock      
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan, amount of employer securities included in plan assets $ 0.0