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Retirement Plans (Amounts Recognized for Pension and Other Postretirement Benefit Plans) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Projected benefit obligations:      
Service cost $ 1.3 $ 1.5 $ 1.5
Interest cost 9.8 9.9 11.2
Plan assets:      
Beginning of year 353.5    
End of year 251.8 353.5  
Recognized on balance sheet:      
Pension asset 0.6 16.8  
Pension Plan, Defined Benefit [Member]      
Projected benefit obligations:      
Beginning of year 336.8 359.5  
Service cost 1.3 1.5  
Interest cost 9.8 9.9  
Actuarial loss (gain) (74.0) (10.8)  
Benefits paid (22.7) (23.3)  
End of year   336.8 359.5
Accumulated benefit obligation at end of year 251.2 336.8  
Plan assets:      
Beginning of year 353.5 360.4  
Actual return on plan assets (79.0) 16.4  
Benefits paid (22.7) (23.3)  
End of year 251.8 353.5 $ 360.4
Accrued benefit cost at end of year:      
Unfunded status 0.6 16.8  
Recognized on balance sheet:      
Pension asset 0.6 16.8  
Recognized in accumulated other comprehensive loss, before tax:      
Net actuarial loss (gain) 78.7 59.9  
Recognized in accumulated other comprehensive loss, before tax $ 78.7 $ 59.9