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Retirement Plans (Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Service cost $ 1.6 $ 1.8 $ 2.0
Interest cost 13.9 14.3 14.3
Expected return on plan assets (16.2) (16.5) (16.9)
Amortization of net loss (gain) 1.9 3.2 4.0
Curtailment / special settlement loss (gain) 0.7 0.0 0.0
Other 0.1 0.0 0.0
Defined Benefit Plan, Net Periodic Benefit Cost other than Service Cost 0.4 1.0 1.4
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 2.0 2.8 $ 3.4
Pension Plan, Defined Benefit [Member]      
Service cost 1.6 1.8  
Interest cost $ 13.9 $ 14.3