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Revenue from Contracts with Clients Disaggregation of Revenues Table (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 118,200,000 | $ 123,500,000 | $ 341,000,000 | $ 351,400,000
Revenues | 7,873,000,000 | 7,118,300,000 | 21,617,400,000 | 21,543,900,000
Transferred at Point in Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 95,000,000 | 102,000,000 | 274,700,000 | 289,200,000
Transferred over Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 23,200,000 | 21,500,000 | 66,300,000 | 62,200,000
UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 474,800,000 | 431,900,000 | 1,458,400,000 | 1,159,900,000
Europe [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 77,800,000 | 48,500,000 | 184,900,000 | 141,500,000
South America [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 15,300,000 | 16,700,000 | 39,200,000 | 48,400,000
Middle East and Asia [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,303,800,000 | 6,620,000,000 | 19,929,700,000 | 20,191,000,000
Other (geographic location) [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,300,000 | 1,200,000 | 5,200,000 | 3,100,000
Commission and Clearing Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 97,500,000 | 105,100,000 | 282,100,000 | 298,000,000
Interest Income [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 53,200,000 | 33,700,000 | 146,400,000 | 85,600,000
Sales Based Commissions [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Sales Commissions and Fees | 56,400,000 | 58,600,000 | 157,900,000 | 166,300,000
Sales Based Commissions [Domain] | Exhange-Traded Futures and Options [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 40,400,000 | 45,000,000 | 110,700,000 | 123,600,000
Sales Based Commissions [Domain] | OTC Derivative Brokerage [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,700,000 | 7,300,000 | 23,900,000 | 23,100,000
Sales Based Commissions [Domain] | Equities and Fixed Income Commissions [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,300,000 | 2,700,000 | 11,100,000 | 8,300,000
Sales Based Commissions [Domain] | Mutual Fund Sales Based Commissions [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,600,000 | 1,500,000 | 6,100,000 | 5,600,000
Sales Based Commissions [Domain] | Variable Annuity [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,100,000 | 1,500,000 | 5,100,000 | 4,500,000
Sales Based Commissions [Domain] | Other Sales Based Commissions [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 300,000 | 600,000 | 1,000,000 | 1,200,000
Trailing Commissions [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 6,700,000 | 6,900,000 | 20,000,000 | 20,800,000
Trailing Commissions [Domain] | Variable Annuity [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,600,000 | 3,700,000 | 10,700,000 | 11,000,000
Trailing Commissions [Domain] | Mutual Fund Trailing Commissions [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,100,000 | 3,200,000 | 9,300,000 | 9,800,000
Clearing Fees [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 30,300,000 | 34,200,000 | 89,700,000 | 93,700,000
Trade Conversion Fees [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,300,000 | 1,600,000 | 6,200,000 | 5,400,000
Other Commissions [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,800,000 | 3,800,000 | 8,300,000 | 11,800,000
Consulting, management, and account fees [Domain] | Sweep Program Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,200,000.0 | 3,300,000.0 | 12,100,000.0 | 8,200,000.0
Consulting, management, and account fees [Domain] | Advisory and Consulting Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,100,000 | 4,900,000 | 14,800,000 | 14,300,000
Consulting, management, and account fees [Domain] | Asset Management [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,200,000 | 6,400,000 | 19,400,000 | 18,900,000
Consulting, management, and account fees [Domain] | Underwriting Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 200,000 | 200,000 | 700,000 | 1,500,000
Consulting, management, and account fees [Domain] | Client Account Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,600,000.0 | 2,900,000.0 | 7,800,000.0 | 8,600,000.0
Consulting, management, and account fees [Domain] | Other Consulting, Management, and Account Fees [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,400,000.0 | 700,000.0 | 4,100,000.0 | 1,900,000.0
Other Income [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 20,700,000.0 | 18,400,000.0 | 58,900,000.0 | 53,400,000.0
Principal or Proprietary Transactions [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 102,300,000 | 94,900,000 | 305,400,000 | 270,500,000
Sales [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,599,300,000 | 6,866,200,000 | 20,824,600,000 | 20,836,400,000
Sales [Member] | Precious Metals Trading Revenues [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,327,800,000 | 6,613,000,000 | 19,944,200,000 | 20,176,500,000
Sales [Member] | Physical Commodity Origination and Merchandising [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 271,500,000 | $ 253,200,000 | $ 880,400,000 | $ 659,900,000

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