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Supplemental Balance Sheet Information (Other Assets) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Sep. 30, 2012
Balance Sheet Related Disclosures [Abstract]    
Long-term deferred tax asset $ 68.2 $ 97.3
Other intangible assets 267.4 143.7
Other 179.2 144.7
Total other assets $ 514.8 $ 385.7