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v3.19.3.a.u2

Revenues from contracts with customers (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 11,279,600,000 | $ 7,873,000,000 | $ 7,192,200,000 | $ 6,552,200,000 | $ 6,078,800,000 | $ 7,118,300,000 | $ 6,507,000,000 | $ 7,918,600,000 | $ 32,897,000,000 | $ 27,622,700,000 | $ 29,423,600,000
Commission and clearing fees |  |  |  |  |  |  |  |  | 372,400,000 | 391,800,000 | 318,600,000
Consulting, management, and account fees |  |  |  |  |  |  |  |  | 79,600,000 | 71,100,000 | 65,000,000
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 452,000,000 | 462,900,000 | 383,600,000
Sales of physical commodities |  |  |  |  |  |  |  |  | 31,830,300,000 | 26,682,400,000 | 28,673,300,000
Principal gains, net |  |  |  |  |  |  |  |  | 415,800,000 | 354,100,000 | 297,000,000
Interest income |  |  |  |  |  |  |  |  | 198,900,000 | 123,300,000 | 69,700,000
Transferred at Point in Time [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 362,700,000 | 379,700,000 | 306,900,000
Transferred over Time [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 89,300,000 | 83,200,000 | 76,700,000
Commission and Clearing Fees |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commission and clearing fees |  |  |  |  |  |  |  |  | 372,400,000 | 391,800,000 | 318,600,000
Trailing Commissions [Domain] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commission and clearing fees |  |  |  |  |  |  |  |  | 26,800,000 | 27,800,000 | 27,300,000
Trailing Commissions [Domain] | Variable Annuity [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commission and clearing fees |  |  |  |  |  |  |  |  | 14,400,000 | 14,600,000 | 14,200,000
Trailing Commissions [Domain] | Mutual Fund Trailing Commissions [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commission and clearing fees |  |  |  |  |  |  |  |  | 12,400,000 | 13,200,000 | 13,100,000
Clearing Fees [Domain] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commission and clearing fees |  |  |  |  |  |  |  |  | 118,800,000 | 123,300,000 | 88,500,000
Trade Conversion Fees [Domain] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commission and clearing fees |  |  |  |  |  |  |  |  | 7,500,000 | 6,800,000 | 0
Other Commissions [Domain] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commission and clearing fees |  |  |  |  |  |  |  |  | 10,100,000 | 15,100,000 | 12,900,000
Consulting, management, and account fees [Domain] | Underwriting Fees [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consulting, management, and account fees |  |  |  |  |  |  |  |  | 700,000 | 1,700,000 | 2,300,000
Consulting, management, and account fees [Domain] | Asset Management [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consulting, management, and account fees |  |  |  |  |  |  |  |  | 26,200,000 | 24,800,000 | 25,700,000
Consulting, management, and account fees [Domain] | Advisory and Consulting Fees [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consulting, management, and account fees |  |  |  |  |  |  |  |  | 20,000,000 | 19,000,000 | 17,700,000
Consulting, management, and account fees [Domain] | Sweep Program Fees [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consulting, management, and account fees |  |  |  |  |  |  |  |  | 16,300,000.0 | 11,600,000.0 | 6,000,000.0
Consulting, management, and account fees [Domain] | Client Account Fees [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consulting, management, and account fees |  |  |  |  |  |  |  |  | 10,600,000.0 | 11,100,000.0 | 10,800,000.0
Consulting, management, and account fees [Domain] | Other Consulting, Management, and Account Fees [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consulting, management, and account fees |  |  |  |  |  |  |  |  | 5,800,000.0 | 2,900,000.0 | 2,500,000.0
Consulting, management, and account fees |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consulting, management, and account fees |  |  |  |  |  |  |  |  | 79,600,000.0 | 71,100,000.0 | 65,000,000.0
Sales [Member] | Precious Metals Trading Revenues [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales of physical commodities |  |  |  |  |  |  |  |  | 30,694,500,000 | 25,762,900,000 | 28,018,400,000
Sales [Member] | Physical Commodity Origination and Merchandising [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales of physical commodities |  |  |  |  |  |  |  |  | 1,135,800,000 | 919,500,000 | 654,900,000
Principal gains, net |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal gains, net |  |  |  |  |  |  |  |  | 415,800,000 | 354,100,000 | 297,000,000
Interest Income |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 198,900,000 | 123,300,000 | 69,700,000
Sales Based Commissions [Domain] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commission and clearing fees |  |  |  |  |  |  |  |  | 209,200,000 | 218,800,000 | 189,900,000
Sales Based Commissions [Domain] | Exhange-Traded Futures and Options [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commission and clearing fees |  |  |  |  |  |  |  |  | 144,900,000 | 163,400,000 | 129,700,000
Sales Based Commissions [Domain] | OTC Derivative Brokerage [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commission and clearing fees |  |  |  |  |  |  |  |  | 32,100,000 | 30,300,000 | 28,300,000
Sales Based Commissions [Domain] | Equities and Fixed Income Commissions [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commission and clearing fees |  |  |  |  |  |  |  |  | 16,100,000 | 11,200,000 | 16,000,000
Sales Based Commissions [Domain] | Mutual Fund Sales Based Commissions [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commission and clearing fees |  |  |  |  |  |  |  |  | 7,500,000 | 7,200,000 | 7,900,000
Sales Based Commissions [Domain] | Variable Annuity [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commission and clearing fees |  |  |  |  |  |  |  |  | 7,300,000 | 5,800,000 | 6,000,000
Sales Based Commissions [Domain] | Other Sales Based Commissions [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commission and clearing fees |  |  |  |  |  |  |  |  | $ 1,300,000 | $ 900,000 | $ 2,000,000

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