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Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk - Obligations to Purchase Financial Instruments at a Future Date (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Sep. 30, 2013
Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk [Abstract]    
Financial instruments sold, not yet purchased, at fair value $ 211.4 $ 179.9