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Employee Benefit Plans - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Expense recognized as part of compensation and benefits | $ 41.4 | $ 36.9 | $ 35.9
Piper Sandler Companies Retirement Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Maximum 401(k) plan contribution rates as percentage of employee earnings | 100.00% |  |
Retirement plan, employer matching contribution as a percentage of employees' gross pay | 6.00% |  |
Retirement plan, employer profit sharing contribution as a percentage of employees' gross pay | 0.00% | 0.00% | 0.00%
Health and Welfare Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Expense recognized as part of compensation and benefits | $ 24.3 | $ 21.3 | $ 20.9

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- Definition Defined Contribution Plan, Employer Profit Sharing Contribution, Percent of Employees' Gross Pay + References No definition available. + Details
Name: | pipr_DefinedContributionPlanEmployerProfitSharingContributionPercentOfEmployeesGrossPay
Namespace Prefix: | pipr_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of expense incurred for employee benefit plans, including defined benefit and defined contribution plans. amount includes expense for health and welfare plans, a 401(k) retirement savings plan, and a defined benefit post retirement medical plan. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Details
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Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |