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Retirement Plans (Amounts Recognized for Pension and Other Postretirement Benefit Plans) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Projected benefit obligations:      
Service cost $ 1.5 $ 1.5 $ 1.6
Interest cost 9.9 11.2 13.9
Plan assets:      
Beginning of year 360.4    
Defined Benefit Plan, Plan Assets, Contributions by Employer 0.0 0.1  
End of year 353.5 360.4  
Recognized on balance sheet:      
Pension asset 16.8 0.9  
Pension Plan, Defined Benefit [Member]      
Projected benefit obligations:      
Beginning of year 359.5 356.6  
Service cost 1.5 1.5  
Interest cost 9.9 11.2  
Actuarial loss (gain) (10.8) 13.7  
Benefits paid (23.3) (23.5)  
End of year 336.8 359.5 356.6
Accumulated benefit obligation at end of year 336.8 359.5  
Plan assets:      
Beginning of year 360.4 351.6  
Actual return on plan assets 16.4 32.2  
Benefits paid (23.3) (23.5)  
End of year 353.5 360.4 $ 351.6
Accrued benefit cost at end of year:      
Unfunded status 16.8 0.9  
Recognized on balance sheet:      
Pension asset 16.8 0.9  
Recognized in accumulated other comprehensive loss, before tax:      
Net actuarial loss (gain) 59.9 74.0  
Recognized in accumulated other comprehensive loss, before tax $ 59.9 $ 74.0