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Equity-based Compensation - OM Asset Management Equity Incentive Plan Other Than Options (Details) - Acadian Asset Management Inc - $ / shares
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Restricted shares (RSA)      
Number of shares      
Outstanding at beginning of year (in shares) 0 0 2,500
Granted during the year (in shares) 0 0 0
Forfeited during the year (in shares) 0 0 (125)
Vested during the year (in shares) 0 0 (2,375)
Outstanding at end of year (in shares) 0 0 0
Weighted average grant date fair value per share      
Outstanding at beginning of period, (in dollars per share) $ 0 $ 0 $ 10.09
Granted during the year (in dollars per share) 0 0 0
Forfeited during the year (in dollars per share) 0 0 10.09
Vested during the year (in dollars per share) 0 0 10.09
Outstanding at end of period, (in dollars per share) $ 0 $ 0 $ 0
Restricted stock units      
Number of shares      
Outstanding at beginning of year (in shares) 48,797 71,664 38,703
Granted during the year (in shares) 44,639 49,494 59,999
Forfeited during the year (in shares) 0 (15,823) (3,003)
Vested during the year (in shares) (30,747) (56,538) (24,035)
Outstanding at end of year (in shares) 62,689 48,797 71,664
Weighted average grant date fair value per share      
Outstanding at beginning of period, (in dollars per share) $ 24.19 $ 20.95 $ 15.33
Granted during the year (in dollars per share) 21.68 24.04 22.62
Forfeited during the year (in dollars per share) 0 25.05 17.55
Vested during the year (in dollars per share) 23.54 19.72 16.51
Outstanding at end of period, (in dollars per share) $ 22.80 $ 24.19 $ 20.95
Performance Shares      
Number of shares      
Outstanding at beginning of year (in shares) 0 0 9,013
Vested during the year (in shares) 0 0 (7,932)
Other movements (in shares) 0 0 (1,081)
Outstanding at end of year (in shares) 0 0 0
Weighted average grant date fair value per share      
Outstanding at beginning of period, (in dollars per share) $ 0 $ 0 $ 14.62
Vested during the year (in dollars per share) 0 0 14.62
Other movements (in dollars per share) 0 0 14.62
Outstanding at end of period, (in dollars per share) $ 0 $ 0 $ 0