v3.26.3
Fair Value of Financial Instruments and Other Assets - Narrative (Details)
shares in Millions, canton_coin in Millions
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 01, 2026
shares
Nov. 30, 2025
USD ($)
canton_coin
shares
Sep. 30, 2026
USD ($)
shares
Sep. 30, 2025
USD ($)
Sep. 30, 2026
USD ($)
shares
Sep. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Jun. 30, 2026
USD ($)
Apr. 30, 2024
USD ($)
Fair Value of Financial Instruments                  
Investment in available for sale debt securities     $ 0   $ 0   $ 24,857,000    
Fair value adjustments or credit losses     0 $ 0 0 $ 0      
Unrealized gains on reclassification from other comprehensive income (loss) to other income (loss)     20,822,000 0 20,822,000 0      
Other income (loss), net     18,742,000 39,420,000 24,864,000 56,306,000      
Tax expense     65,098,000 59,068,000 198,355,000 163,886,000      
Investment in equity securities     62,961,000   62,961,000        
Gains (losses) included in other comprehensive income (loss)       5,900,000   9,500,000      
Total revenue     584,545,000 508,598,000 1,761,255,000 1,531,246,000      
Cash received from sale of digital assets         0 15,000,000      
Digital asset loan receivable             24,411,000    
Accounts receivable, allowance for credit losses     113,000   113,000   587,000    
Unrealized gain relating to level 3 assets held       29,800,000   50,600,000      
Equity method investments     23,100,000   23,100,000   4,500,000    
Unfunded capital commitment     5,000,000.0   5,000,000.0   5,000,000.0    
Equity pickup loss     600,000 0 1,500,000 0      
Impairments recorded on equity method investments     0 0 0 0      
Unrealized gains     14,400,000   41,000,000.0        
Equity investment impairment     0 3,800,000 0 9,200,000      
Cumulative impairments on minority equity investments held     22,700,000   22,700,000        
Cumulative unrealized gains on minority equity investments held     45,300,000   45,300,000        
Significant Unobservable Inputs (Level 3)                  
Fair Value of Financial Instruments                  
Investment in available for sale debt securities     0   0   24,857,000    
Investment in equity securities     $ 0   $ 0        
Digital asset loan receivable             0    
Measurement Input, Discount Rate | Significant Unobservable Inputs (Level 3) | Minimum                  
Fair Value of Financial Instruments                  
Equity securities without readily determinable fair value, measurement input     0.135   0.135        
Measurement Input, Discount Rate | Significant Unobservable Inputs (Level 3) | Maximum                  
Fair Value of Financial Instruments                  
Equity securities without readily determinable fair value, measurement input     0.250   0.250        
Measurement Input, Discount Rate | Significant Unobservable Inputs (Level 3) | Weighted Average                  
Fair Value of Financial Instruments                  
Equity securities without readily determinable fair value, measurement input     0.169   0.169        
Measurement Input, Perpetual Growth Rate | Significant Unobservable Inputs (Level 3) | Minimum                  
Fair Value of Financial Instruments                  
Equity securities without readily determinable fair value, measurement input     0.020   0.020        
Measurement Input, Perpetual Growth Rate | Significant Unobservable Inputs (Level 3) | Maximum                  
Fair Value of Financial Instruments                  
Equity securities without readily determinable fair value, measurement input     0.030   0.030        
Measurement Input, Perpetual Growth Rate | Significant Unobservable Inputs (Level 3) | Weighted Average                  
Fair Value of Financial Instruments                  
Equity securities without readily determinable fair value, measurement input     0.023   0.023        
Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssets                  
Fair Value of Financial Instruments                  
Equity investment without readily determinable fair values     $ 142,600,000   $ 142,600,000   44,800,000    
Pre-Funded Warrants                  
Fair Value of Financial Instruments                  
Gains (losses) included in other comprehensive income (loss)     $ (3,600,000)   $ (20,400,000)        
Class of warrant or right outstanding (in shares) | shares   8.1              
Warrants and rights outstanding   $ 25,000,000.0         39,800,000    
Unrealized (loss) gain related to changes of the fair value             14,800,000    
Class of warrant or right, exercised (in shares) | shares     0.0   3.0        
Other                  
Fair Value of Financial Instruments                  
Total revenue     $ 4,799,000 5,925,000 $ 17,106,000 14,798,000      
Canton Coins                  
Fair Value of Financial Instruments                  
Cash received from sale of digital assets       15,000,000.0   15,000,000.0      
Crypto asset, realized gain   $ 24,900,000   14,900,000   14,900,000      
Crypto asset, unrealized gain (loss)     (24,000,000.0) 28,300,000 (42,000,000.0) 50,600,000      
Crypto asset, sale, number of units | canton_coin   161              
Crypto asset, loan receivable   $ 25,000,000.0              
Unrealized (loss) gain related to changes of the fair value       43,249,000   65,535,000      
Canton Coins | Other                  
Fair Value of Financial Instruments                  
Total revenue     1,400,000 2,300,000 6,800,000 4,400,000      
Digital Asset Loan Receivable                  
Fair Value of Financial Instruments                  
Digital asset loan receivable             24,400,000    
Accounts receivable, allowance for credit losses             200,000    
Unrealized loss             400,000    
Securitize, Inc.                  
Fair Value of Financial Instruments                  
Amortized cost basis             10,900,000 $ 11,100,000 $ 10,000,000.0
Number of shares received upon debt conversion (in shares) | shares 2.9                
Additional number of shares receivable upon contingent right (in shares) | shares 0.1                
Contingent consideration earnout period 5 years                
Investment in available for sale debt securities             $ 24,900,000 $ 38,600,000  
Fair value adjustments or credit losses     0 0 0 0      
Unrealized gains on reclassification from other comprehensive income (loss) to other income (loss)     20,800,000   20,800,000        
Investment in equity securities     43,700,000   43,700,000        
Equity securities, unrealized gain     5,000,000.0   5,000,000.0        
Gains (losses) included in other comprehensive income (loss)     0 5,900,000 13,500,000 9,500,000      
Securitize, Inc. | Reclassification out of Accumulated Other Comprehensive Income | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent                  
Fair Value of Financial Instruments                  
Other income (loss), net     27,500,000   27,500,000        
Tax expense     $ 6,700,000   $ 6,700,000        
Impaired Investment One                  
Fair Value of Financial Instruments                  
Equity securities without readily determinable fair value, downward price adjustment, annual amount           3,300,000      
Impaired Investment Two                  
Fair Value of Financial Instruments                  
Equity securities without readily determinable fair value, downward price adjustment, annual amount           5,400,000      
Impaired Investment Three                  
Fair Value of Financial Instruments                  
Equity investment without readily determinable fair values       0   0      
Equity securities without readily determinable fair value, downward price adjustment, annual amount       $ 500,000   $ 500,000      
Convertible Notes Payable                  
Fair Value of Financial Instruments                  
Interest rate                 5.00%