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Retirement Plans (Amounts Recognized for Pension and Other Postretirement Benefit Plans) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Projected benefit obligations:      
Service cost $ 0.7 $ 0.6 $ 0.8
Interest cost 12.0 13.9 13.9
Plan assets:      
Beginning of year 261.4    
End of year 250.9 261.4  
Pension Plan, Defined Benefit [Member]      
Projected benefit obligations:      
Beginning of year 247.9 233.2  
Service cost 0.7 0.6  
Interest cost 12.0 13.9  
Actuarial loss (gain) (7.7) 22.2  
Benefits paid (21.5) (22.0)  
End of year 231.4 247.9 233.2
Plan assets:      
Beginning of year 261.4 239.8  
Actual return on plan assets 11.0 43.6  
Benefits paid (21.5) (22.0)  
End of year 250.9 261.4 $ 239.8
Accrued benefit cost at end of year:      
Funded (unfunded) status 19.5 13.5  
Recognized on balance sheet:      
Pension asset 19.5 13.5  
Recognized in accumulated other comprehensive loss, before tax:      
Net actuarial loss (gain) $ 50.2 $ 56.6