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Retirement Plans (Amounts Recognized for Pension and Other Postretirement Benefit Plans) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Plan assets:      
End of year $ 410.5 $ 395.2  
Pension Plan, Defined Benefit [Member]
      
Projected benefit obligations:      
Beginning of year 399.6 448.3  
Service cost 1.7 2.0 1.8
Interest cost 19.9 18.3 20.2
Actuarial loss (gain) 67.3 (42.5)  
Benefits paid (26.0) (26.0)  
Currency translation (0.8) (0.5)  
Decrease in obligation due to curtailment (0.2) 0  
Other 0.1 0 0
End of year 461.5 399.6 448.3
Accumulated benefit obligation at end of year 461.5 399.5  
Plan assets:      
Beginning of year 395.2 387.1  
Actual return on plan assets 42.1 34.4  
Employer contributions 0.1 0.2  
Currency translation (0.9) (0.5)  
Benefits paid (26.0) (26.0)  
End of year 410.5 395.2 387.1
Accrued benefit cost at end of year:      
Unfunded status (51.0) (4.4)  
Recognized on balance sheet:      
Other noncurrent assets 1.3 1.3  
Other noncurrent liabilities (52.3) (5.7)  
Amount recognized on balance sheet (51.0) (4.4)  
Recognized in accumulated other comprehensive loss, before tax:      
Prior year service cost (gain) 0.1 0.2  
Net actuarial loss (gain) 119.7 74.5  
Recognized in accumulated other comprehensive loss, before tax 119.8 74.7  
Other Plans [Member]
      
Projected benefit obligations:      
Beginning of year   0.2  
Service cost   0  
Interest cost   0  
Actuarial loss (gain)   0  
Benefits paid   (0.2)  
Currency translation   0  
Decrease in obligation due to curtailment   0  
End of year   0  
Accumulated benefit obligation at end of year   0  
Plan assets:      
Beginning of year   0  
Actual return on plan assets   0  
Employer contributions   0.2  
Currency translation   0  
Benefits paid   (0.2)  
End of year   0  
Accrued benefit cost at end of year:      
Unfunded status   0  
Recognized on balance sheet:      
Other noncurrent assets   0  
Other noncurrent liabilities   0  
Amount recognized on balance sheet   0  
Recognized in accumulated other comprehensive loss, before tax:      
Prior year service cost (gain)   0  
Net actuarial loss (gain)   0  
Recognized in accumulated other comprehensive loss, before tax   $ 0