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Retirement Plans (Amounts Recognized for Pension and Other Postretirement Benefit Plans) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Projected benefit obligations:      
Service cost $ 1.6 $ 1.8 $ 2.0
Interest cost 13.9 14.3 14.3
Decrease in obligation due to curtailment / settlement (6.5) 0.0  
Plan assets:      
Beginning of year 343.5    
Defined Benefit Plan, Plan Assets, Contributions by Employer 0.6 0.0  
End of year 351.6 343.5  
Recognized in accumulated other comprehensive loss, before tax:      
Other (0.2) (0.2)  
Pension Plan, Defined Benefit [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Other current liabilities 0.0 (1.1)  
Projected benefit obligations:      
Beginning of year 333.4 380.5  
Service cost 1.6 1.8  
Interest cost 13.9 14.3  
Actuarial loss (gain) 38.2 (38.6)  
Benefits paid (23.9) (24.3)  
Currency translation (0.1) (0.3)  
Decrease in obligation due to curtailment / settlement 6.5 0.0  
End of year 356.6 333.4 380.5
Accumulated benefit obligation at end of year 356.6 333.4  
Plan assets:      
Beginning of year 343.5 366.3  
Actual return on plan assets 38.6 2.0  
Currency translation (0.5) (0.3)  
Benefits paid (23.9) (24.3)  
End of year 351.6 343.5 $ 366.3
Accrued benefit cost at end of year:      
Unfunded status (5.0) 10.1  
Recognized on balance sheet:      
Other noncurrent assets 0.0 11.2  
Other noncurrent liabilities (5.0) 0.0  
Amount recognized on balance sheet (5.0) 10.1  
Recognized in accumulated other comprehensive loss, before tax:      
Prior year service cost (gain) 0.0 0.0  
Net actuarial loss (gain) 78.4 66.0  
Recognized in accumulated other comprehensive loss, before tax $ 78.4 $ 66.0