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Related Party Transactions - Transactions with Executive Officers and Directors (Howard & Brandon Lutnick) (Details)
1 Months Ended 3 Months Ended
Oct. 06, 2025
USD ($)
shares
May 19, 2025
shares
May 16, 2025
$ / shares
shares
Feb. 05, 2025
$ / shares
shares
Jan. 13, 2025
$ / shares
shares
Mar. 31, 2026
$ / shares
shares
Feb. 28, 2026
$ / shares
shares
Mar. 31, 2026
$ / shares
shares
Mar. 31, 2025
shares
Jan. 02, 2025
shares
Related Party Transaction                    
Share price (in dollars per share) | $ / shares       $ 14.14 $ 11.93          
Class A Common Stock                    
Related Party Transaction                    
Treasury stock repurchases (in shares)           9,319,716 59,601 9,379,317 0  
Shares repurchased price (in dollars per share) | $ / shares           $ 14.54 $ 14.65 $ 14.54    
Stock repurchased, gross (in shares)       2,653,272            
Shares withheld for tax withholding obligation (in shares)         232,380          
Stock repurchased (in shares)       1,309,367 186,732          
Mr. Lutnick | Rights for Previously Non-Exchangeable PSUs                    
Related Party Transaction                    
Warrants and rights outstanding (in shares)       1,148,970           101,133
Class of warrant or right, number of securities called by warrants or rights (in shares)       1,148,970           101,133
Class of warrant or right, issued upon conversion (in shares)       2,859,437            
Class of warrant or right, conversion ratio       0.9279            
Stock repurchased, gross (in shares)         419,112          
Shares withheld for tax withholding obligation (in shares)       1,343,905            
Sale of Class A Common Stock to Company | Mr. Lutnick                    
Related Party Transaction                    
Treasury stock repurchases (in shares)     10,969,533              
Shares repurchased price (in dollars per share) | $ / shares     $ 11.58              
Treasury stock repurchases | $ $ 13,096,795.7                  
Sale of Class A Common Stock to Company | Mr. Lutnick | Mr. Lutnick                    
Related Party Transaction                    
Treasury stock repurchases (in shares)     7,989,936              
Sale of Class A Common Stock to Company | Mr. Lutnick | Personal Asset Trust                    
Related Party Transaction                    
Treasury stock repurchases (in shares)     2,843,781              
Sale of Class A Common Stock to Company | Mr. Lutnick | Family Trust                    
Related Party Transaction                    
Treasury stock repurchases (in shares)     3,384              
Sale of Class A Common Stock to Company | Mr. Lutnick | Spouse                    
Related Party Transaction                    
Treasury stock repurchases (in shares) 4,400   2,573              
Sale of Class A Common Stock to Company | Mr. Lutnick | Howard W. Lutnick, Spouse and Trusts                    
Related Party Transaction                    
Treasury stock repurchases (in shares) 129,859 10,839,674 129,859              
Sale of Class A Common Stock to Company | Mr. Lutnick | CF Group Management, Inc.                    
Related Party Transaction                    
Treasury stock repurchases | $ $ 200,000