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Revenue from Contracts with Clients Disaggregation of Revenues Table (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 115,500,000 | $ 118,200,000 | $ 363,200,000 | $ 341,000,000.0
Revenues | 8,243,400,000 | 7,873,000,000.0 | 39,854,700,000 | 21,617,400,000
Commission and clearing fees | 96,100,000 | 97,500,000 | 299,900,000 | 282,100,000
Consulting, management, and account fees | 19,400,000 | 20,700,000 | 63,300,000 | 58,900,000
Transferred at Point in Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 95,100,000 | 95,000,000.0 | 293,400,000 | 274,700,000
Transferred over Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 20,400,000 | 23,200,000 | 69,800,000 | 66,300,000
UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 554,200,000 | 474,800,000 | 1,652,100,000 | 1,458,400,000
Europe [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 114,100,000 | 77,800,000 | 375,700,000 | 184,900,000
South America [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 14,600,000 | 15,300,000 | 46,100,000 | 39,200,000
Middle East and Asia [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,558,500,000 | 7,303,800,000 | 37,777,300,000 | 19,929,700,000
Other (geographic location) [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,000,000.0 | 1,300,000 | 3,500,000 | 5,200,000
Interest Income [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 22,400,000 | 53,200,000 | 110,100,000 | 146,400,000
Brokerage commissions revenue [Domain] | Exhange-Traded Futures and Options [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 36,400,000 | 40,400,000 | 108,900,000 | 110,700,000
Brokerage commissions revenue [Domain] | OTC Derivative Brokerage [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,000,000.0 | 7,700,000 | 16,200,000 | 23,900,000
Brokerage commissions revenue [Domain] | Equities and Fixed Income Commissions [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,200,000 | 4,300,000 | 16,600,000 | 11,100,000
Brokerage commissions revenue [Domain] | Mutual Fund Sales Based Commissions [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,100,000 | 1,600,000 | 4,000,000.0 | 6,100,000
Brokerage commissions revenue [Domain] | insurance and annuity products [Domain] [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,700,000 | 2,100,000 | 6,200,000 | 5,100,000
Brokerage commissions revenue [Domain] | Other Commissions [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,600,000 | 2,800,000 | 14,000,000.0 | 8,300,000
Brokerage commissions revenue [Domain] | Other Sales Based Commissions [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 300,000 | 300,000 | 1,100,000 | 1,000,000.0
Brokerage commissions revenue [Domain] | Sales Based Commissions [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales Commissions and Fees | 48,700,000 | 56,400,000 | 153,000,000.0 | 157,900,000
Brokerage commissions revenue [Domain] | Mutual Fund Trailing Commissions [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,100,000 | 3,100,000 | 9,700,000 | 9,300,000
Brokerage commissions revenue [Domain] | Insurance and annuity product trailing commissions [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,600,000 | 3,600,000 | 11,300,000 | 10,700,000
Brokerage commissions revenue [Domain] | Trade Conversion Fees [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,800,000 | 1,300,000 | 7,500,000 | 6,200,000
Brokerage commissions revenue [Domain] | Clearing Fees [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 33,300,000 | 30,300,000 | 104,400,000 | 89,700,000
Brokerage commissions revenue [Domain] | Trailing Commissions [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 6,700,000 | 6,700,000 | 21,000,000.0 | 20,000,000.0
Consulting, management, and account fees [Domain] | Sweep Program Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,000,000.0 | 4,200,000 | 8,600,000 | 12,100,000
Consulting, management, and account fees [Domain] | Advisory and Consulting Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,700,000 | 5,100,000 | 17,000,000.0 | 14,800,000
Consulting, management, and account fees [Domain] | Asset Management [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,000,000.0 | 7,200,000 | 23,200,000 | 19,400,000
Consulting, management, and account fees [Domain] | Underwriting Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 200,000 | 400,000 | 700,000
Consulting, management, and account fees [Domain] | Client Account Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,800,000 | 2,600,000 | 8,900,000 | 7,800,000
Consulting, management, and account fees [Domain] | Other Consulting, Management, and Account Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,900,000 | 1,400,000 | 5,200,000 | 4,100,000
Principal or Proprietary Transactions [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 161,000,000.0 | 102,300,000 | 442,000,000.0 | 305,400,000
Sales of physical commodities [Member] | Precious Metals Trading Revenues [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,621,200,000 | 7,327,800,000 | 37,973,900,000 | 19,944,200,000
Sales of physical commodities [Member] | Physical Commodity Origination and Merchandising [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 323,300,000 | $ 271,500,000 | $ 965,500,000 | $ 880,400,000

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