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Retirement Plans (Amounts Recognized for Pension and Other Postretirement Benefit Plans) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Projected benefit obligations:      
Service cost $ 0.8 $ 1.3 $ 1.5
Interest cost 13.9 9.8 9.9
Plan assets:      
Beginning of year 251.8    
End of year 239.8 251.8  
Recognized on balance sheet:      
Pension asset 6.6 0.6  
Pension Plan, Defined Benefit [Member]      
Projected benefit obligations:      
Beginning of year 251.2 336.8  
Service cost 0.8 1.3  
Interest cost 13.9 9.8  
Actuarial loss (gain) (10.4) (74.0)  
Benefits paid (22.3) (22.7)  
End of year   251.2 336.8
Accumulated benefit obligation at end of year 233.2 251.2  
Plan assets:      
Beginning of year 251.8 353.5  
Actual return on plan assets 10.3 (79.0)  
Benefits paid (22.3) (22.7)  
End of year 239.8 251.8 $ 353.5
Accrued benefit cost at end of year:      
Unfunded status 6.6 0.6  
Recognized on balance sheet:      
Pension asset 6.6 0.6  
Recognized in accumulated other comprehensive loss, before tax:      
Net actuarial loss (gain) 68.2 78.7  
Recognized in accumulated other comprehensive loss, before tax $ 68.2 $ 78.7