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Retirement Plans (Amounts Recognized for Pension and Other Postretirement Benefit Plans) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Plan assets:      
Beginning of year $ 383.4    
Defined Benefit Plan, Contributions by Employer 0.0 $ 1.2  
Settlement (58.5)    
End of year 340.0 383.4  
Pension Plan, Defined Benefit [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Other current liabilities (1.2) 0.0  
Projected benefit obligations:      
Beginning of year 428.2 461.5  
Service cost 1.7 1.9 $ 1.7
Interest cost 18.9 20.1 19.9
Actuarial loss (gain) 37.7 (25.9)  
Benefits paid (25.1) (26.0)  
Currency translation 0.2 (1.6)  
Decrease in obligation due to curtailment / settlement 58.5 1.8  
End of year 403.1 428.2 461.5
Accumulated benefit obligation at end of year 403.1 428.2  
Plan assets:      
Beginning of year 383.4 410.5  
Actual return on plan assets 40.1 1.3  
Settlement (58.5) (1.9)  
Currency translation 0.1 (1.7)  
Benefits paid (25.1) (26.0)  
End of year 340.0 383.4 $ 410.5
Accrued benefit cost at end of year:      
Unfunded status (63.1) (44.8)  
Recognized on balance sheet:      
Other noncurrent assets 1.0 0.9  
Other noncurrent liabilities (62.9) (45.7)  
Amount recognized on balance sheet (63.1) (44.8)  
Recognized in accumulated other comprehensive loss, before tax:      
Prior year service cost (gain) 0.0 0.0  
Net actuarial loss (gain) 110.8 113.5  
Recognized in accumulated other comprehensive loss, before tax $ 110.8 $ 113.5