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Pay vs Performance Disclosure - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pay vs Performance Disclosure [Table] |  |  |
Pay vs Performance [Table Text Block] | PAY VERSUS PERFORMANCE The following table sets forth the compensation comparisons to selected company and peer performance measures, in each case as determined in accordance with Item 402(v) of SEC Regulation S-K. The “Compensation Actually Paid” and other compensation figures shown here are calculated in accordance with applicable regulatory guidance and do not reflect the Committee’s perspective on compensation, including as actually paid. The Committee’s perspective is described in the discussion beginning on page 40. A discussion of the key differences between calculations made according to applicable regulatory guidance and the Committee’s perspective on compensation begins on page 46.
|  | 2020 (1) |  |  | 2021 |  |  | 2022
Summary Compensation Total for PEO (2) |  |  | $10,666,487 |  |  |  | $13,555,232 |  |  |  | $12,865,048 |
Compensation Actually Paid to PEO (3) |  |  | $16,500,215 |  |  |  | $24,502,824 |  |  |  | $8,864,980 |
Average Summary Compensation Total for Non-PEO NEOs (2) |  |  | $5,029,682 |  |  |  | $7,212,128 |  |  |  | $5,599,912 |
Average Compensation Actually Paid to Non-PEO NEOs (3) |  |  | $7,119,305 |  |  |  | $11,194,181 |  |  |  | $4,201,855 |
Value of Fixed $100 Investment Based On: |  |  |  |  |  |  |  |  |  |  |  |
Total Shareholder Return (4) |  |  | $126 |  |  |  | $178 |  |  |  | $152 |
Peer Group Total Shareholder Return (4, 5) |  |  | $111 |  |  |  | $157 |  |  |  | $133 |
Net Income (6) |  |  | $476,211,000 |  |  |  | $789,271,000 |  |  |  | $624,874,000 |
Non-GAAP Pre-Tax Net Income (7) |  |  | $711,624,000 |  |  |  | $1,132,395,000 |  |  |  | $952,215,000 |
| (1) | During the first implementation year of Item 402(v) of SEC Regulation S-K, registrants are permitted to limit their disclosure to three years. The NEOs described are Ronald J. Kruszewski, James M. Zemlyak, Victor J. Nesi, Thomas B. Michaud and James M. Marischen.
| (2) | See the Summary Compensation Table, page 47.
| (3) | To calculate, according to applicable regulatory guidance, “Compensation Actually Paid”, the Company has (a) deducted equity award amounts reported in the Summary Compensation Table, (b) added the year-end fair value of all equity awards granted in the covered fiscal year that are outstanding and unvested as of the end of the covered fiscal year; (c) added the amount of change as of the end of the covered fiscal year (from the end of the prior fiscal year) in fair value of any awards granted in prior years that are outstanding and unvested as of the end of the covered fiscal year (d) added the fair value as of the vesting date of awards that are granted and vest in the same covered fiscal year; (e) added the amount equal to the change as of the vesting date (from the end of the prior fiscal year) in fair value of awards granted in prior years that vest in the covered fiscal year; (f) deducted the amount equal to the fair value at the end of the prior fiscal year of awards granted in prior years that the Company has determined are more likely than not to fail to meet the applicable vesting conditions during the covered fiscal year; and (f) added the dollar value of any dividends or other earnings paid on stock or option awards in the covered fiscal year prior to the vesting date that are not otherwise reflected in the fair value of such award or included in any other component of total compensation for the covered fiscal year. No other adjustments under the regulatory guidance apply to any Company NEO.
| (4) | Total Shareholder Return is based on a $100 common equity investment at the close of December 31, 2019.
| (5) | The Peer Group is as reported in the Company’s most recent Form 10-K, as required by Item 201(e) of Regulation S-K and as discussed above on page 38, and is composed of Affiliated Managers Group Inc., Ameriprise Financial, Inc., Cowen Inc., Evercore Inc., Franklin Resources, Inc., Houlihan Lokey, Inc., Invesco Ltd., Jefferies Financial Group Inc., Lazard Ltd., LPL Financial Holdings Inc., Moelis & Company, Northern Trust Corp., Piper Sandler Companies, Raymond James Financial, Inc. and T. Rowe Price Group, Inc.
| (6) | See page 46.
| (7) | S ee page 24. I tem 402(v) of SEC Regulation S-K requires the Company to select and report exactly one performance measure that is both “most important” and not otherwise reported in the above table. The Company has selected this measure because it is the most important primary performance measure used by the Committee in considering NEO compensation. The other primary performance measures, to which the Committee accords great importance, are Non-GAAP Net Revenue and Non-GAAP Earnings Per Share. With respect to Non-GAAP Pre-Tax Net Income, calculations are adjusted for acquisition-related charges other than duplicative expenses and litigation-related expenses. The Committee’s perspective on these and other performance measures is described in more detail beginning on page 40.
Company Selected Measure Name | Non-GAAP Pre-Tax Net Income |  |
Named Executive Officers, Footnote [Text Block] | The NEOs described are Ronald J. Kruszewski, James M. Zemlyak, Victor J. Nesi, Thomas B. Michaud and James M. Marischen. |  |
Peer Group Issuers, Footnote [Text Block] | The Peer Group is as reported in the Company’s most recent Form 10-K, as required by Item 201(e) of Regulation S-K and as discussed above on page 38, and is composed of Affiliated Managers Group Inc., Ameriprise Financial, Inc., Cowen Inc., Evercore Inc., Franklin Resources, Inc., Houlihan Lokey, Inc., Invesco Ltd., Jefferies Financial Group Inc., Lazard Ltd., LPL Financial Holdings Inc., Moelis & Company, Northern Trust Corp., Piper Sandler Companies, Raymond James Financial, Inc. and T. Rowe Price Group, Inc. |  |
PEO Total Compensation Amount | $ 12,865,048 | $ 13,555,232 | $ 10,666,487
PEO Actually Paid Compensation Amount | $ 8,864,980 | 24,502,824 | 16,500,215
Adjustment To PEO Compensation, Footnote [Text Block] | To calculate, according to applicable regulatory guidance, “Compensation Actually Paid”, the Company has (a) deducted equity award amounts reported in the Summary Compensation Table, (b) added the year-end fair value of all equity awards granted in the covered fiscal year that are outstanding and unvested as of the end of the covered fiscal year; (c) added the amount of change as of the end of the covered fiscal year (from the end of the prior fiscal year) in fair value of any awards granted in prior years that are outstanding and unvested as of the end of the covered fiscal year (d) added the fair value as of the vesting date of awards that are granted and vest in the same covered fiscal year; (e) added the amount equal to the change as of the vesting date (from the end of the prior fiscal year) in fair value of awards granted in prior years that vest in the covered fiscal year; (f) deducted the amount equal to the fair value at the end of the prior fiscal year of awards granted in prior years that the Company has determined are more likely than not to fail to meet the applicable vesting conditions during the covered fiscal year; and (f) added the dollar value of any dividends or other earnings paid on stock or option awards in the covered fiscal year prior to the vesting date that are not otherwise reflected in the fair value of such award or included in any other component of total compensation for the covered fiscal year. No other adjustments under the regulatory guidance apply to any Company NEO. |  |
Non-PEO NEO Average Total Compensation Amount | $ 5,599,912 | 7,212,128 | 5,029,682
Non-PEO NEO Average Compensation Actually Paid Amount | $ 4,201,855 | 11,194,181 | 7,119,305
Adjustment to Non-PEO NEO Compensation Footnote [Text Block] | To calculate, according to applicable regulatory guidance, “Compensation Actually Paid”, the Company has (a) deducted equity award amounts reported in the Summary Compensation Table, (b) added the year-end fair value of all equity awards granted in the covered fiscal year that are outstanding and unvested as of the end of the covered fiscal year; (c) added the amount of change as of the end of the covered fiscal year (from the end of the prior fiscal year) in fair value of any awards granted in prior years that are outstanding and unvested as of the end of the covered fiscal year (d) added the fair value as of the vesting date of awards that are granted and vest in the same covered fiscal year; (e) added the amount equal to the change as of the vesting date (from the end of the prior fiscal year) in fair value of awards granted in prior years that vest in the covered fiscal year; (f) deducted the amount equal to the fair value at the end of the prior fiscal year of awards granted in prior years that the Company has determined are more likely than not to fail to meet the applicable vesting conditions during the covered fiscal year; and (f) added the dollar value of any dividends or other earnings paid on stock or option awards in the covered fiscal year prior to the vesting date that are not otherwise reflected in the fair value of such award or included in any other component of total compensation for the covered fiscal year. No other adjustments under the regulatory guidance apply to any Company NEO. |  |
Tabular List [Table Text Block] | As required by Item 402(v) of SEC Regulation S-K, and consistent with the Company’s Incentive Assessment Framework described on page 24, the following list sets forth, unranked, up to seven of the most important Company perforamance measures for linking executive compensation to Company performance:
| · |  | Non-GAAP Pre-Tax Net Income
| · |  | Non-GAAP Net Revenue
| · |  | Non-GAAP Earnings Per Share
| · |  | Non-GAAP Return on Common Equity
| · |  | Total Shareholder Return
| · |  | Non-GAAP Pre-Tax Margin on Net Revenues
| · |  | Book Value Per Share
Total Shareholder Return Amount | $ 152 | 178 | 126
Peer Group Total Shareholder Return Amount | 133 | 157 | 111
Net Income (Loss) | $ 624,874,000 | $ 789,271,000 | $ 476,211,000
Company Selected Measure Amount | 952,215,000 | 1,132,395,000 | 711,624,000
Salary | $ 105,747 |  |
Bonus | 2,118 |  |
All Other Compensation | 3,000 |  |
Total | $ 110,865 |  |
Measure [Axis]: 1 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Non-GAAP Pre-Tax Net Income |  |
Non-GAAP Measure Description [Text Block] | S ee page 24. I tem 402(v) of SEC Regulation S-K requires the Company to select and report exactly one performance measure that is both “most important” and not otherwise reported in the above table. The Company has selected this measure because it is the most important primary performance measure used by the Committee in considering NEO compensation. The other primary performance measures, to which the Committee accords great importance, are Non-GAAP Net Revenue and Non-GAAP Earnings Per Share. With respect to Non-GAAP Pre-Tax Net Income, calculations are adjusted for acquisition-related charges other than duplicative expenses and litigation-related expenses. The Committee’s perspective on these and other performance measures is described in more detail beginning on page 40. |  |
Measure [Axis]: 2 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Non-GAAP Net Revenue |  |
Measure [Axis]: 3 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Non-GAAP Earnings Per Share |  |
Measure [Axis]: 4 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Non-GAAP Return on Common Equity |  |
Measure [Axis]: 5 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Total Shareholder Return |  |
Measure [Axis]: 6 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Non-GAAP Pre-Tax Margin on Net Revenues |  |
Measure [Axis]: 7 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Book Value Per Share |  |
Ronald J. Kruszewski [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Salary | $ 200,000 |  |
Bonus | 4,000,000 |  |
Stock Awards | 8,000,000 |  |
All Other Compensation | 665,048 |  |
Total | $ 12,865,048 |  |

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