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Earnings Per Share - Computation of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Earnings Per Share, Basic, by Common Class, Including Two Class Method                      
Net income attributable to Piper Sandler Companies $ 113,968 $ 60,266 $ 42,182 $ 64,915 $ 69,059 $ 34,789 $ 34,773 $ 42,493 $ 281,331 $ 181,114 $ 85,491
Shares for basic and diluted calculations                      
Average shares used in basic computation (in shares) 16,829 16,716 16,703 16,378 16,052 15,921 15,879 15,499 16,658 15,838 14,958
Average shares used in diluted computation (in shares) 17,813 17,808 17,726 17,788 17,870 17,769 17,633 17,504 17,785 17,695 17,224
Earnings per common share                      
Basic $ 6.77 $ 3.61 $ 2.53 $ 3.96 $ 4.30 $ 2.19 $ 2.19 $ 2.74 $ 16.89 $ 11.44 $ 5.72
Diluted $ 6.40 $ 3.38 $ 2.38 $ 3.65 $ 3.86 $ 1.96 $ 1.97 $ 2.43 $ 15.82 $ 10.24 $ 4.96
Stock options                      
Shares for basic and diluted calculations                      
Dilutive impact of securities (in shares)                 60 55 25
Restricted stock units                      
Shares for basic and diluted calculations                      
Dilutive impact of securities (in shares)                 153 184 163
Restricted stock                      
Shares for basic and diluted calculations                      
Dilutive impact of securities (in shares)                 914 1,617 2,079