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Retirement Plans (Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Service cost $ 2.0 $ 1.7 $ 1.9
Interest cost 14.3 18.9 20.1
Expected return on plan assets 16.9 19.7 24.6
Amortization of net loss (gain) (4.0) (3.4) (3.2)
Curtailment / special settlement loss (gain) 0.0 (16.6) (0.5)
Other 0.0 0.1 0.0
Defined Benefit Plan, Net Periodic Benefit Cost other than Service Cost 1.4 19.3 (0.8)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 3.4 21.0 $ 1.1
Pension Plan, Defined Benefit [Member]      
Service cost 2.0 1.7  
Interest cost $ 14.3 $ 18.9