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Regulatory Requirements and Subsidiary Dividend Restrictions - Customer Secured Funds (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Sep. 30, 2014
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Cash and Securities Segregated under Commodity Exchange Act [Abstract] |  |
Cash Segregated under Commodity Exchange Act Regulation | $ 126.9 | $ 314.0
Securities Segregated under Commodity Exchange Act Regulation | 492.5 | 0.0
Securities Held for Customers in Lieu of Cash, At Banks, Segregated under Commodity Exchange Act Regulation | 0.9 | 0.5
Deposits with and Receivables From Clearing Organizations, Segregated under Commodity Exchange Act Regulation | 1,237.8 | 1,476.5
Securities Held for Customers in Lieu of Cash, Segregated under Commodity Exchange Act Regulation | 22.1 | 14.8
Cash and Securities Segregated under Commodity Exchange Act Regulation |  | 1,805.8
Cash and Securities Segregated under Commodity Exchange Act Regulation, Amount Required to be Segregated |  | 1,769.3
Cash and Securities Segregated under Commodity Exchange Act Regulation, Excess Funds in Segregation | 49.3 | 36.5
Cash and Securities Segregated under Other Regulations [Abstract] |  |
Cash Segregated under Other Regulations | 64.7 | 46.8
Securities Segregated under Other Regulations | 0.0 | 0.0
Equities with Futures Commission Merchants Segregated under Other Regulations | 2.6 | 11.9
Amounts Held by Clearing Organizations Segregated under Other Regulations | 0.0 | 0.0
Amounts Held by Members of Foreign Boards of Trade Segregated under Other Regulations | 18.3 | 14.5
Secured funds |  | 73.2
Secured Funds Required Under Commodity Exchange Act |  | 53.3
Cash and Securities Segregated under Other Regulations | $ 20.4 | $ 19.9

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