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Regulatory Requirements and Subsidiary Dividend Restrictions Regulatory Requirements and Subsidiary Dividend Restrictions - Customer Secured Funds (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Sep. 30, 2011
Cash and Securities Segregated under Commodity Exchange Act [Abstract]    
Cash Segregated under Commodity Exchange Act Regulation $ 225.6 $ 71.3
Securities Segregated under Commodity Exchange Act Regulation 0 5.5
Securities Held for Customers in Lieu of Cash, At Banks, Segregated under Commodity Exchange Act Regulation 47.2 3.7
Deposits with and Receivables From Clearing Organizations, Segregated under Commodity Exchange Act Regulation 1,370.4 1,358.0
Securities Held for Customers in Lieu of Cash, Segregated under Commodity Exchange Act Regulation 22.3 19.0
Cash and Securities Segregated under Commodity Exchange Act Regulation 1,665.5 1,457.5
Cash and Securities Segregated under Commodity Exchange Act Regulation, Amount Required to be Segregated 1,620.5 1,406.6
Cash and Securities Segregated under Commodity Exchange Act Regulation, Excess Funds in Segregation 45.0 50.9
Cash and Securities Segregated under Other Regulations [Abstract]    
Cash Segregated under Other Regulations 25.2 6.4
Securities Segregated under Other Regulations 3.3 0
Equities with Futures Commission Merchants Segregated under Other Regulations 9.9 30.3
Amounts Held by Clearing Organizations Segregated under Other Regulations 20.8 0
Amounts Held by Members of Foreign Boards of Trade Segregated under Other Regulations 30.1 2.1
Secured funds 89.3 38.8
Secured Funds Required Under Commodity Exchange Act 77.6 27.2
Cash and Securities Segregated under Other Regulations $ 11.7 $ 11.6