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Retirement Plans (Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Service cost $ 1.5 $ 1.5 $ 1.6
Interest cost 9.9 11.2 13.9
Expected return on plan assets (15.7) (16.9) (16.2)
Amortization of net loss (gain) 2.5 2.8 1.9
Curtailment / special settlement loss (gain) 0.0 0.0 0.7
Other 0.0 (0.1) 0.1
Defined Benefit Plan, Net Periodic Benefit Cost other than Service Cost (3.3) (3.0) 0.4
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) (1.8) (1.5) $ 2.0
Pension Plan, Defined Benefit [Member]      
Service cost 1.5 1.5  
Interest cost $ 9.9 11.2  
Curtailment / special settlement loss (gain)   $ (1.1)