Earnings Per Share - Calculation of Pro Forma Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Numerator:
Net income attributable to controlling interests	$ 11.4	$ 28.6	$ 23.4	$ 52.4
Denominator:
Weighted-average shares of common stock outstanding—basic (in shares)	41,484,303	41,425,555	41,464,362	42,690,683
Potential shares of common stock:
Weighted average diluted common stock outstanding (in shares)	42,645,419	42,518,125	42,678,109	43,915,806
Basic
Basic earnings per share of common stock attributable to controlling interests (in dollars per share)	$ 0.27	$ 0.69	$ 0.56	$ 1.23
Diluted
Diluted earnings per share of common stock attributable to controlling interests (in dollars per share)	$ 0.27	$ 0.67	$ 0.55	$ 1.19
Restricted stock units
Potential shares of common stock:
Restricted stock units/Employee stock options (in shares)	1,695	6,935	4,617	8,523
Employee stock options
Potential shares of common stock:
Restricted stock units/Employee stock options (in shares)	1,159,421	1,085,635	1,209,130	1,216,600