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Retirement Plans (Amounts Recognized for Pension and Other Postretirement Benefit Plans) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Projected benefit obligations:      
Service cost $ 2.0 $ 1.7 $ 1.9
Interest cost 14.3 18.9 20.1
Plan assets:      
Beginning of year 340.0    
Defined Benefit Plan, Plan Assets, Contributions by Employer 35.0 0.0 1.2
Settlement (58.5)    
End of year 366.3 340.0  
Pension Plan, Defined Benefit [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Other current liabilities (1.1) (1.2)  
Projected benefit obligations:      
Beginning of year 403.1 428.2  
Service cost 2.0 1.7  
Interest cost 14.3 18.9  
Actuarial loss (gain) (14.5) 37.7  
Benefits paid (24.8) (25.1)  
Currency translation 0.4 0.2  
Decrease in obligation due to curtailment / settlement 0.0 58.5  
End of year 380.5 403.1 428.2
Accumulated benefit obligation at end of year 380.5 403.1  
Plan assets:      
Beginning of year 340.0 383.4  
Actual return on plan assets 15.8 40.1  
Settlement 0.0 (58.5)  
Currency translation 0.4 0.1  
Benefits paid (24.8) (25.1)  
End of year 366.3 340.0 $ 383.4
Accrued benefit cost at end of year:      
Unfunded status (14.2) (63.1)  
Recognized on balance sheet:      
Other noncurrent assets 1.1 1.0  
Other noncurrent liabilities (14.2) (62.9)  
Amount recognized on balance sheet (14.2) (63.1)  
Recognized in accumulated other comprehensive loss, before tax:      
Prior year service cost (gain) 0.0 0.0  
Net actuarial loss (gain) 93.4 110.8  
Recognized in accumulated other comprehensive loss, before tax $ 93.4 $ 110.8