Organization and Basis of Presentation	12 Months Ended
Organization and Basis of Presentation	Dec. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	ORGANIZATION AND BASIS OF PRESENTATION Organization Piper Sandler Companies is the parent company of Piper Sandler & Co., a securities broker dealer and investment banking firm; Piper Sandler Ltd., a firm providing securities brokerage and mergers and acquisitions services in the United Kingdom ("U.K."); Piper Sandler Investment Group Inc., PSC Capital Management LLC, PSC Capital Management II LLC and PSC Capital Management III LLC, entities providing alternative asset management services; Piper Sandler Hedging Services, LLC, an entity that assists clients with hedging strategies; Piper Sandler Financial Products II Inc., an entity that facilitates derivative transactions; and other immaterial subsidiaries. Piper Sandler Companies and its subsidiaries (collectively, the "Company") operate in one reporting segment providing investment banking services and institutional sales, trading and research services. Investment banking services include financial advisory services, management of and participation in underwritings, and municipal financing activities. Revenues are generated through the receipt of advisory and financing fees. Institutional sales, trading and research services focus on the trading of equity and fixed income products with institutions, corporations, government and non-profit entities. Revenues are generated through commissions and sales credits earned on equity and fixed income institutional sales activities, net interest revenues on trading securities held in inventory, profits and losses from trading these securities, and fees for research services and corporate access offerings. Also, the Company has created alternative asset management funds in merchant banking and healthcare in order to invest firm capital and to manage capital from outside investors. The Company records gains and losses from investments in these funds and receives management and performance fees. Basis of Presentation The accompanying consolidated financial statements have been prepared in accordance with United States ("U.S.") generally accepted accounting principles ("GAAP") and include the accounts of Piper Sandler Companies, its wholly owned subsidiaries, and all other entities in which the Company has a controlling financial interest. Noncontrolling interests represent equity interests in consolidated entities that are not attributable, either directly or indirectly, to Piper Sandler Companies. Noncontrolling interests include the minority equity holders' proportionate share of the equity in the Company's alternative asset management funds. All material intercompany balances have been eliminated. The preparation of financial statements and related disclosures in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Although these estimates and assumptions are based on the best information available, actual results could differ from those estimates. Common Stock Split On February 6, 2026, the Company's board of directors approved a four-for-one forward split of its common stock. The stock split will be effected through the filing of an amendment to the Company's amended and restated certificate of incorporation, which will be accompanied by a proportionate increase in the number of shares of the Company's authorized common stock. At the effective time of the filing of the amendment on March 23, 2026, every share of the Company's common stock will automatically become four shares of the Company's common stock. The Company's common stock is expected to begin trading on the split-adjusted basis at the start of trading on March 24, 2026. As the stock split has not yet been effected, the accompanying financial statements and per-share data do not reflect the impact of the stock split. The stock split will be reflected in future financial statements following its effective date. See Note 22 for the unaudited proforma earnings per share on a post-split basis.