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Employee Benefit Obligations - Schedule of Plan Assets (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Sep. 30, 2012
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 190.8 $ 168.6
UNITED STATES
   
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 73.8 66.4
UNITED STATES | Mutual funds - equity | Fair Value, Inputs, Level 1
   
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 32.8 20.5
UNITED STATES | Common collective trusts - equity | Level 2
   
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 19.9 25.8
UNITED STATES | Common collective trusts - fixed income | Level 2
   
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 20.5 19.5
UNITED STATES | Other plan asset investments | Level 2
   
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0.6 0.6
Outside of the United States
   
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 117.0 102.2
Outside of the United States | Common collective trusts - equity | Level 2
   
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 46.5 38.5
Outside of the United States | Common collective trusts - fixed income | Level 2
   
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 15.9 15.7
Outside of the United States | Insurance contracts - general fund | Level 2
   
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 37.7 40.6
Outside of the United States | Other plan asset investments | Level 2
   
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 10.3 $ 7.4