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Regulatory Requirements and Subsidiary Dividend Restrictions - Customer Secured Funds (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Sep. 30, 2015
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Cash and Securities Segregated under Commodity Exchange Act [Abstract] |  |
Cash Segregated under Commodity Exchange Act Regulation | $ 383.6 | $ 126.9
Securities Segregated under Commodity Exchange Act Regulation | 595.4 | 492.5
Securities Held for Customers in Lieu of Cash, At Banks, Segregated under Commodity Exchange Act Regulation | 1.8 | 0.9
Deposits with and Receivables From Clearing Organizations, Segregated under Commodity Exchange Act Regulation | 1,173.9 | 1,237.8
Securities Held for Customers in Lieu of Cash, Segregated under Commodity Exchange Act Regulation | 23.2 | 22.1
Cash and Securities Segregated under Commodity Exchange Act Regulation |  | 1,880.2
Cash and Securities Segregated under Commodity Exchange Act Regulation, Amount Required to be Segregated |  | 1,830.9
Cash and Securities Segregated under Commodity Exchange Act Regulation, Excess Funds in Segregation | 51.5 | 49.3
Cash and Securities Segregated under Other Regulations [Abstract] |  |
Cash Segregated under Other Regulations | 70.5 | 64.7
Securities Segregated under Other Regulations | 0.0 | 0.0
Equities with Futures Commission Merchants Segregated under Other Regulations | 3.6 | 2.6
Amounts Held by Clearing Organizations Segregated under Other Regulations | 6.7 | 0.0
Amounts Held by Members of Foreign Boards of Trade Segregated under Other Regulations | 26.9 | 18.3
Secured funds |  | 85.6
Secured Funds Required Under Commodity Exchange Act |  | 65.2
Cash and Securities Segregated under Other Regulations | $ 16.4 | $ 20.4

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