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Fair Value Measurements - Narrative (Details)
 3 Months Ended 9 Months Ended
Dec. 31, 2023
USD ($)
security
Sep. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
Mar. 31, 2023
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Alternative assets $ 302,810,000       $ 302,810,000   $ 385,851,000
Gain (loss) on investments 7,448,000     $ 11,478,000 7,935,000 $ (30,738,000)  
Equity securities without readily determinable fair value $ 64,500,000       $ 64,500,000   21,600,000
Number of securities with an upward adjustment | security 1       1    
Equity securities, cumulative upward adjustment $ 10,800,000       $ 10,800,000    
Equity securities, upward adjustment 0     0 0 3,300,000  
Loss on impairment of goodwill 883,223,000 $ 306,700,000 $ 1,100,000,000 $ 0 2,286,212,000 $ 0  
Cumulative impairment loss $ 2,300,000,000       $ 2,300,000,000    
Long-term growth rate 3.00% 3.00% 3.00%   3.00%    
Goodwill $ 81,714,000       $ 81,714,000   2,367,926,000 [1]
Ben Markets              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Loss on impairment of goodwill         0    
Goodwill $ 9,885,000 $ 9,900,000 $ 9,900,000   $ 9,885,000   $ 9,885,000
Minimum              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Discount rates 26.30% 25.30% 24.80%   26.30%    
Maximum              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Discount rates 27.20% 26.20% 25.60%   27.20%    
[1] Retroactively adjusted March 31, 2023 for the de-SPAC merger transaction as described in Note 4. Such adjustments are unaudited.