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Retirement Plans (Amounts Recognized for Pension and Other Postretirement Benefit Plans) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Plan assets:      
Beginning of year $ 410.5    
Defined Benefit Plan, Contributions by Employer 1.2    
End of year 383.4 $ 410.5  
Pension Plan, Defined Benefit [Member]      
Projected benefit obligations:      
Beginning of year 461.5 399.6  
Service cost 1.9 1.7 $ 2.0
Interest cost 20.1 19.9 18.3
Actuarial loss (gain) (25.9) 67.3  
Benefits paid (26.0) (26.0)  
Currency translation (1.6) (0.8)  
Decrease in obligation due to curtailment / settlement 1.8 0.2  
End of year 428.2 461.5 399.6
Accumulated benefit obligation at end of year 428.2 461.5  
Plan assets:      
Beginning of year 410.5 395.2  
Actual return on plan assets 1.3 42.1  
Defined Benefit Plan, Contributions by Employer   0.1  
Settlement (1.9) 0.0  
Currency translation (1.7) (0.9)  
Benefits paid (26.0) (26.0)  
End of year 383.4 410.5 $ 395.2
Accrued benefit cost at end of year:      
Unfunded status (44.8) (51.0)  
Recognized on balance sheet:      
Other noncurrent assets 0.9 1.3  
Other noncurrent liabilities (45.7) (52.3)  
Amount recognized on balance sheet (44.8) (51.0)  
Recognized in accumulated other comprehensive loss, before tax:      
Prior year service cost (gain) 0.0 0.1  
Net actuarial loss (gain) 113.5 119.7  
Recognized in accumulated other comprehensive loss, before tax $ 113.5 $ 119.8