Equity-based Compensation - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)	4,500,000
Compensation costs to be recognized next year	$ 800,000
Total intrinsic value of options exercised	24,700,000	$ 5,100,000	$ 6,000,000.0
Amount received related to the exercise of options	100,000	0	0.0
Tax benefit related to exercise of options	100,000	$ 300,000	$ 300,000
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share based compensation expense	$ 1,200,000
Unrecognized share based compensation expense recognition period	1 year 7 months 6 days
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	0	0	0
Fair value options vested	$ 0.0	$ 1,300,000	$ 1,300,000
Total intrinsic value of options exercised	0	14,128,440	13,767,753
Brightsphere Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	900,000	1,200,000	2,400,000
Income tax benefit	$ 100,000	$ 200,000	$ 300,000
Brightsphere Equity Incentive Plan | Restricted stock units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Brightsphere Equity Incentive Plan | Restricted stock units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Brightsphere Equity Incentive Plan | Restricted shares (RSA)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted during the year (in shares)	0	0	0
Brightsphere Equity Incentive Plan | Restricted shares (RSA) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Brightsphere Equity Incentive Plan | Restricted shares (RSA) | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Brightsphere Equity Incentive Plan | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted during the year (in shares)	0	0	0
Vesting period	3 years