Organization and Description of the Business (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Feb. 28, 2025
Organization and description of the business
Common stock, shares authorized (in shares)	230,000,000	230,000,000
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Stock repurchase program, authorized amount				$ 80.0
Repurchase of common stock (in shares)	1,799,423	4,445,534	268,800
Average price of common stock repurchased (in dollars per share)	$ 26.64	$ 21.32	$ 19.03
Repurchase of ordinary shares	$ 48.0	$ 94.9	$ 5.1
Consolidated Entity Excluding Consolidated Funds | Additional paid-in capital
Organization and description of the business
Repurchase of common stock including excise taxes	1.7	0.4	0.3
Consolidated Entity Excluding Consolidated Funds | Retained earnings (deficit)
Organization and description of the business
Repurchase of common stock including excise taxes	46.7	95.2	$ 4.8
Repurchase of ordinary shares, excluding excise tax	$ 46.3	$ 94.5
Acadian Asset Management Inc | Paulson
Organization and description of the business
Parent owned interest	21.80%