Investments - Schedule of Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Schedule of Equity Method Investments
Investments at fair value	$ 252,419	$ 285,881
Investments at cost	281	281
Investments accounted for under the equity method	13,858	11,886
Total investments	266,558	298,048
Less: Investments attributable to noncontrolling interests	(183,293)	(211,096)
Total investments attributable to Piper Sandler Companies	83,265	$ 86,952
Level III
Schedule of Equity Method Investments
Investments at cost	$ 300