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Supplemental Information (Other Income Expense) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Other Income (Expense) [Abstract]      
Technology and royalty income $ 22.9 $ 24.3 $ 19.0
Interest income 5.4 5.7 3.4
Foreign exchange 1.1 (8.6) 4.0
Sale of assets and investments 8.4 14.6 16.4
Amortization of intangibles (3.5) (5.5) (8.4)
Government grants 15.2 9.5 0
Other (2.4) 1.7 8.5
Total Other Income (Expense), net $ 47.1 $ 41.7 $ 42.9