Fair Value Measurements (Details) (Recurring basis, USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Sep. 30, 2012
Fair value
Non-pension financial assets and liabilities measured at fair value
Total assets	$ 5.3	$ 0.6
Total liabilities	8.7	6.7
Fair value | Foreign currency options
Non-pension financial assets and liabilities measured at fair value
Total assets	0.1	0.1
Fair value | Option contracts
Non-pension financial assets and liabilities measured at fair value
Total assets	0.2	0.1
Fair value | Foreign currency forward contracts
Non-pension financial assets and liabilities measured at fair value
Total assets	5.0	0.4
Total liabilities	5.2	0.6
Fair value | Interest rate swap agreements
Non-pension financial assets and liabilities measured at fair value
Total liabilities	3.5	6.1
Quoted Prices in Active Markets for Similar Assets (Level 2)
Non-pension financial assets and liabilities measured at fair value
Total assets	5.3	0.6
Total liabilities	8.7	6.7
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) | Option contracts
Non-pension financial assets and liabilities measured at fair value
Total assets	0.2	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	5.0	0.4
Total liabilities	5.2	0.6
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	$ 3.5	$ 6.1