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Assets and Liabilities, at Fair Value Assets and Liabilities, at Fair Value - Schedule of Financial Instruments Owned and Sold, Not Yet Purchased (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Sep. 30, 2012
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Derivative Liabilities	$ 36.8	$ 44.6

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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