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Employee Benefit Plans - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	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

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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.

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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.

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

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