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Earnings Per Share - Computation of Earnings Per Share Pro Forma (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
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
Diluted (in shares) 17,813 17,808 17,726 17,788 17,870 17,769 17,633 17,504 17,785 17,695 17,224
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                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method                      
Dilutive impact of securities (in shares)                 60 55 25
Restricted Stock Units (RSUs) [Member]                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method                      
Dilutive impact of securities (in shares)                 153 184 163
Restricted stock                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method                      
Dilutive impact of securities (in shares)                 914 1,617 2,079
Pro Forma [Member]                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method                      
Average shares used in basic computation (in shares)                 66,632 63,354 59,830
Diluted (in shares)                 71,140 70,780 68,896
Basic                 $ 4.22 $ 2.86 $ 1.43
Diluted                 $ 3.95 $ 2.56 $ 1.24
Pro Forma [Member] | Stock options                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method                      
Dilutive impact of securities (in shares)                 239 221 99
Pro Forma [Member] | Restricted Stock Units (RSUs) [Member]                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method                      
Dilutive impact of securities (in shares)                 614 736 651
Pro Forma [Member] | Restricted stock                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method                      
Dilutive impact of securities (in shares)                 3,655 6,469 8,316