Organization and Description of the Business (Details) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
	Mar. 25, 2017	Jun. 30, 2020 USD ($) segment $ / shares shares	Jun. 30, 2019 segment	Jun. 30, 2020 USD ($) segment $ / shares shares	Jun. 30, 2019 segment	Feb. 25, 2019
Business Acquisition [Line Items]
Number of reportable segments (in segments) | segment		3	3	3	3
Ordinary shares repurchased (in shares) | shares		2,437,700		5,667,962
Average price of ordinary shares repurchased (in dollars per share) | $ / shares		$ 6.56		$ 6.20
Value of treasury stock acquired using the cost method | $		$ 16.0		$ 35.3
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%