Annual report pursuant to Section 13 and 15(d)

Retirement Benefits (Details 2)

v2.4.0.6
Retirement Benefits (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Cash Flows      
Cash contribution to defined benefit retirement plans $ 4.0 $ 2.8 $ 6.5
Defined Contribution Plans      
Expenses related to defined contribution plans 8.0 6.7 5.8
Minimum
     
Defined Contribution Plans      
Contribution vesting period 0 years    
Maximum
     
Defined Contribution Plans      
Employer's contribution to defined contribution plans (as a percent) 4.00%    
Employer's matching contribution to defined contribution plans (as a percent) 6.00%    
Contribution vesting period 5 years    
Pension plans
     
Fair Value Measurements      
Fair value of plan assets 226.3 203.2 195.7
Cash Flows      
Cash contribution to defined benefit retirement plans 3.1 2.5 6.1
Estimated Future Benefit Payments      
2013 12.7    
2014 13.6    
2015 14.5    
2016 15.3    
2017 16.1    
2018 - 2022 91.3    
Pension plans | Minimum
     
Cash Flows      
Estimated cash contribution to defined benefit retirement plans 12.9    
Fair Value | Pension plans
     
Fair Value Measurements      
Fair value of plan assets 226.3 203.2  
Level 1 | Pension plans
     
Fair Value Measurements      
Fair value of plan assets 27.1 127.0  
Level 2 | Pension plans
     
Fair Value Measurements      
Fair value of plan assets 197.2 74.1  
Level 3 | Pension plans
     
Fair Value Measurements      
Fair value of plan assets 2.0 2.1  
Cash equivalents | Fair Value | Pension plans
     
Fair Value Measurements      
Fair value of plan assets 7.6 7.6  
Cash equivalents | Level 1 | Pension plans
     
Fair Value Measurements      
Fair value of plan assets 5.3 5.3  
Cash equivalents | Level 2 | Pension plans
     
Fair Value Measurements      
Fair value of plan assets 2.3 2.3  
Equity Investments | Fair Value | Pension plans
     
Fair Value Measurements      
Fair value of plan assets 7.3 20.1  
Equity Investments | Level 1 | Pension plans
     
Fair Value Measurements      
Fair value of plan assets 7.3 20.1  
Corporate bonds | Fair Value | Pension plans
     
Fair Value Measurements      
Fair value of plan assets 10.1 71.5  
Corporate bonds | Level 1 | Pension plans
     
Fair Value Measurements      
Fair value of plan assets 10.1 10.5  
Corporate bonds | Level 2 | Pension plans
     
Fair Value Measurements      
Fair value of plan assets   61.0  
Government index funds | Fair Value | Pension plans
     
Fair Value Measurements      
Fair value of plan assets 4.4 8.3  
Government index funds | Level 1 | Pension plans
     
Fair Value Measurements      
Fair value of plan assets 4.4 8.3  
Equity mutual funds | Fair Value | Pension plans
     
Fair Value Measurements      
Fair value of plan assets 93.4 82.8  
Equity mutual funds | Level 1 | Pension plans
     
Fair Value Measurements      
Fair value of plan assets   82.8  
Equity mutual funds | Level 2 | Pension plans
     
Fair Value Measurements      
Fair value of plan assets 93.4    
Corporate bond funds | Fair Value | Pension plans
     
Fair Value Measurements      
Fair value of plan assets 101.5    
Corporate bond funds | Level 2 | Pension plans
     
Fair Value Measurements      
Fair value of plan assets 101.5    
Real estate and real estate funds | Fair Value | Pension plans
     
Fair Value Measurements      
Fair value of plan assets 2.0 2.1  
Real estate and real estate funds | Level 3 | Pension plans
     
Fair Value Measurements      
Fair value of plan assets 2.0 2.1  
Municipal bonds | Fair Value | Pension plans
     
Fair Value Measurements      
Fair value of plan assets   8.6  
Municipal bonds | Level 2 | Pension plans
     
Fair Value Measurements      
Fair value of plan assets   8.6  
Asset backed debt securities in trust | Fair Value | Pension plans
     
Fair Value Measurements      
Fair value of plan assets   0.1  
Asset backed debt securities in trust | Level 2 | Pension plans
     
Fair Value Measurements      
Fair value of plan assets   0.1  
U.S. Government securities | Fair Value | Pension plans
     
Fair Value Measurements      
Fair value of plan assets   2.1  
U.S. Government securities | Level 2 | Pension plans
     
Fair Value Measurements      
Fair value of plan assets   $ 2.1