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Fair Value Measurements (Details) (Recurring basis, USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Sep. 30, 2013
Fair value
    
Non-pension financial assets and liabilities measured at fair value    
Total assets $ 1.6 $ 1.7
Total liabilities 5.5 5.2
Fair value | Foreign currency options
    
Non-pension financial assets and liabilities measured at fair value    
Total assets 0.1 0.1
Fair value | Foreign currency forward contracts
    
Non-pension financial assets and liabilities measured at fair value    
Total assets 1.5 1.6
Total liabilities 0.8 1.5
Fair value | Interest rate swap agreements
    
Non-pension financial assets and liabilities measured at fair value    
Total liabilities 4.7 3.7
Quoted Prices in Active Markets for Similar Assets (Level 2)
    
Non-pension financial assets and liabilities measured at fair value    
Total assets 1.6 1.7
Total liabilities 5.5 5.2
Quoted Prices in Active Markets for Similar Assets (Level 2) | Foreign currency options
    
Non-pension financial assets and liabilities measured at fair value    
Total assets 0.1 0.1
Quoted Prices in Active Markets for Similar Assets (Level 2) | Foreign currency forward contracts
    
Non-pension financial assets and liabilities measured at fair value    
Total assets 1.5 1.6
Total liabilities 0.8 1.5
Quoted Prices in Active Markets for Similar Assets (Level 2) | Interest rate swap agreements
    
Non-pension financial assets and liabilities measured at fair value    
Total liabilities $ 4.7 $ 3.7