Organization and Description of the Business (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	Mar. 25, 2017	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Feb. 25, 2019
Business Acquisition [Line Items]
Ordinary shares repurchased (in shares)		0	0	4,147,450	0
Average price of ordinary shares repurchased (in dollars per share)				$ 24.09
Value of treasury stock acquired using the cost method				$ 100
BrightSphere Investment Group | Paulson
Business Acquisition [Line Items]
Parent owned interest						21.70%
Parent Company
Business Acquisition [Line Items]
Percent of interest sold	24.95%