Annual report pursuant to Section 13 and 15(d)

Retirement Benefits (Details 3)

v2.3.0.15
Retirement Benefits (Details 3) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Postretirement healthcare plan
     
Defined Benefit Retirement Plans      
Postretirement benefit cost $ 1.3 $ 1.2 $ 1.1
Weighted average assumptions used in revaluing obligation under the postretirement healthcare plan      
Discount rate for obligation, end of year (as a percent) 4.10% 4.50% 5.25%
Healthcare cost rate assumed for next year (as a percent) 7.75% 7.75% 8.50%
Ultimate trend rate (as a percent) 5.00% 5.00% 5.00%
One-percentage-point increase/decrease in the assumed healthcare cost trend rates      
Impact of a one percentage point increase in healthcare cost trends on service and interest costs 0.1    
Impact of a one percentage point decrease in healthcare cost trends on service and interest costs (0.1)    
Impact of a one percentage point increase in healthcare cost trends on the benefit obligation 1.0    
Impact of a one percentage point decrease in healthcare cost trends on the benefit obligation (1.0)    
Employer's expected annual future contribution to the postretirement healthcare plan 0.4    
Benefit obligation 10.1 14.2 12.1
Postretirement healthcare plan | Rotex
     
One-percentage-point increase/decrease in the assumed healthcare cost trend rates      
Benefit obligation 0.9    
Pension plans
     
Weighted average assumptions used in revaluing obligation under the postretirement healthcare plan      
Discount rate for obligation, end of year (as a percent) 4.30% 4.80% 5.50%
One-percentage-point increase/decrease in the assumed healthcare cost trend rates      
Benefit obligation 298.7 269.3 230.2
Pension plans | Level 1 | Rotex
     
One-percentage-point increase/decrease in the assumed healthcare cost trend rates      
Market value of plan assets represented as a percentage of obligation (as a percent) 86.00%    
Pension plans | Rotex
     
One-percentage-point increase/decrease in the assumed healthcare cost trend rates      
Benefit obligation $ 3.6    
Rotex
     
One-percentage-point increase/decrease in the assumed healthcare cost trend rates      
Period for which expenses for plans were immaterial 1