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Retirement Plans (Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Service cost $ 0.8 $ 1.3 $ 1.5
Interest cost 13.9 9.8 9.9
Expected return on plan assets (13.9) (15.4) (15.7)
Amortization of net loss (gain) 3.7 1.7 2.5
Defined Benefit Plan, Net Periodic Benefit Cost other than Service Cost 3.7 (3.9) (3.3)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 4.5 (2.6) $ (1.8)
Pension Plan, Defined Benefit [Member]      
Service cost 0.8 1.3  
Interest cost $ 13.9 $ 9.8