v3.26.1
Organization and Basis of Presentation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jul. 01, 2023
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Related Party Transaction [Line Items]            
Conversion of stock, shares converted (in shares) 64,000,000.0          
Minimum number of shares required to be issued (in shares) 75,000,000          
Restricted Stock Units (RSUs)            
Related Party Transaction [Line Items]            
Shares granted in period (in shares) 25,300,000          
Share-based payment arrangement, decrease for tax withholding obligation $ 74.0          
Maximum | Restricted Shares            
Related Party Transaction [Line Items]            
Shares granted in period (in shares) 38,600,000          
Class A Common Stock            
Related Party Transaction [Line Items]            
Common stock, par value (in dollars per share)   $ 0.01   $ 0.01   $ 0.01
Corporate conversion, exchange ratio (in shares) 1          
Issuance of common stock (in shares)   80,362 83,694 82,432 126,719  
Share-based payment arrangement, decrease for tax withholding obligation   $ 10.0 $ 12.5 $ 19.8 $ 20.9  
Class A Common Stock | BGC Partners            
Related Party Transaction [Line Items]            
Common stock, par value (in dollars per share) $ 0.01          
Class A Common Stock | BGC Group            
Related Party Transaction [Line Items]            
Common stock, par value (in dollars per share) $ 0.01          
Class B Common Stock            
Related Party Transaction [Line Items]            
Common stock, par value (in dollars per share)   $ 0.01   $ 0.01   $ 0.01
Corporate conversion, exchange ratio (in shares) 1          
Issuance of common stock (in shares) 64,000,000.0 0 0 0 0  
Class B Common Stock | Cantor | Related Party            
Related Party Transaction [Line Items]            
Conversion of stock, shares converted (in shares) 64,000,000.0          
Class B Common Stock | BGC Partners            
Related Party Transaction [Line Items]            
Common stock, par value (in dollars per share) $ 0.01          
Class B Common Stock | BGC Group            
Related Party Transaction [Line Items]            
Common stock, par value (in dollars per share) $ 0.01