Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income/(loss)	$ 18,975	$ 40,395	$ (583)	$ 78,140
Other comprehensive income/(loss), net of tax:
Foreign currency translation adjustment	577	(179)	(163)	(65)
Comprehensive income/(loss)	19,552	40,216	(746)	78,075
Comprehensive income/(loss) applicable to noncontrolling interests	7,358	(2,847)	1,073	5,087
Comprehensive income/(loss) applicable to Piper Sandler Companies	$ 12,194	$ 43,063	$ (1,819)	$ 72,988