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Revenue from Contracts with Clients Disaggregation of Revenues Table (Details) - USD ($) | 3 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 108,500,000 | $ 116,500,000
Revenues | 11,245,000,000 | 6,552,200,000
Consulting, management, and account fees | 21,300,000 | 19,100,000
Transferred at Point in Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 84,600,000 | 94,600,000
Transferred over Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Including Assessed Tax | 23,900,000 | 21,900,000
UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 512,300,000 | 527,000,000
Europe [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 111,600,000 | 53,300,000
South America [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 15,200,000 | 11,400,000
Middle East and Asia [Domain] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 10,605,500,000 | 5,958,700,000
Other (geographic location) [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 400,000 | 1,800,000
Commission and Clearing Fees [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 87,200,000 | 97,400,000
Sales Based Commissions [Domain] |  |
Disaggregation of Revenue [Line Items] |  |
Sales Commissions and Fees | 45,900,000 | 53,400,000
Sales Based Commissions [Domain] | Exhange-Traded Futures and Options [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 32,400,000 | 39,100,000
Sales Based Commissions [Domain] | OTC Derivative Brokerage [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 5,500,000 | 8,900,000
Sales Based Commissions [Domain] | Equities and Fixed Income Commissions [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 4,300,000 | 1,100,000
Sales Based Commissions [Domain] | Mutual Fund Sales Based Commissions [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,300,000 | 2,600,000
Sales Based Commissions [Domain] | Variable Annuity [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2,100,000 | 1,500,000
Sales Based Commissions [Domain] | Other Sales Based Commissions [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 300,000 | 200,000
Trailing Commissions [Domain] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 6,800,000 | 6,900,000
Trailing Commissions [Domain] | Variable Annuity [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 3,700,000 | 3,700,000
Trailing Commissions [Domain] | Mutual Fund Trailing Commissions [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 3,100,000 | 3,200,000
Interest Income [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 46,000,000 | 45,000,000
Clearing Fees [Domain] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 29,500,000 | 32,600,000
Trade Conversion Fees [Domain] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,500,000 | 1,600,000
Other Commissions [Domain] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 3,500,000 | 2,900,000
Consulting, management, and account fees [Domain] | Sweep Program Fees [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 4,000,000 | 3,800,000
Consulting, management, and account fees [Domain] | Advisory and Consulting Fees [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 5,600,000 | 5,000,000
Consulting, management, and account fees [Domain] | Asset Management [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 7,500,000 | 6,200,000
Consulting, management, and account fees [Domain] | Underwriting Fees [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 200,000 | 300,000
Consulting, management, and account fees [Domain] | Client Account Fees [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 3,000,000 | 2,700,000
Consulting, management, and account fees [Domain] | Other Consulting, Management, and Account Fees [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,000,000 | 1,100,000
Principal or Proprietary Transactions [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 112,500,000 | 94,900,000
Sales of physical commodities [Member] | Precious Metals Trading Revenues [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 10,658,000,000 | 5,955,600,000
Sales of physical commodities [Member] | Physical Commodity Origination and Merchandising [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 320,000,000 | $ 340,200,000

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