v3.26.3
Earnings Per Share - Computation of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Earnings Per Share, Basic, by Common Class, Including Two Class Method        
Net income attributable to Piper Sandler Companies $ 55,415 $ 60,266 $ 188,502 $ 167,363
Shares for basic and diluted calculations        
Average shares used in basic computation (in shares) 67,257 66,862 [1] 67,596 66,401 [1]
Average shares used in diluted computation (in shares) 70,667 71,232 [1] 71,045 71,100 [1]
Earnings per common share        
Basic $ 0.82 $ 0.90 [1] $ 2.79 $ 2.52 [1]
Diluted $ 0.78 $ 0.85 [1] $ 2.65 $ 2.35 [1]
Stock options        
Shares for basic and diluted calculations        
Dilutive impact of securities (in shares) 182 254 [1] 195 241 [1]
Restricted stock units        
Shares for basic and diluted calculations        
Dilutive impact of securities (in shares) 467 642 [1] 478 592 [1]
Restricted stock        
Shares for basic and diluted calculations        
Dilutive impact of securities (in shares) 2,761 3,474 [1] 2,776 3,866 [1]
[1] Common shares and per common share information have been adjusted to reflect the four-for-one forward split of common stock, as discussed in Note 1.