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Fair Value Disclosures - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended
May 31, 2025
May 31, 2024
May 31, 2025
May 31, 2024
Nov. 30, 2024
Gain (Loss) on Securities [Line Items]          
Transfers of assets from Level 2 to Level 3 $ 31,500,000 $ 99,200,000 $ 71,800,000 $ 59,100,000  
Transfers of assets from Level 3 to Level 2 43,000,000.0 19,200,000 129,000,000.0 33,300,000  
Transfers of liabilities from Level 2 to Level 3 11,500,000 47,300,000 7,900,000 62,000,000.0  
Transfers of liabilities from Level 3 to Level 2 11,200,000 43,500,000 44,400,000 50,900,000  
Net gains (losses) on Level 3 assets (realized and unrealized) 12,800,000 (9,500,000) 2,500,000 (55,000,000.0)  
Total gains/(losses) (realized and unrealized) 32,900,000 (12,800,000) (36,300,000) (4,000,000.0)  
Value of asset excluded from significant unobservable inputs 49,800,000   49,800,000   $ 23,900,000
Value of liability excluded from significant unobservable inputs 4,300,000   4,300,000   2,700,000
Aggregate fair value of loans and other receivables on nonaccrual status and/or 90 days or greater past due 68,400,000   68,400,000   126,900,000
Loan and other receivables greater than 90 days past due 60,000,000.0   60,000,000.0   120,000,000.0
Equity securities without readily determinable fair value 21,900,000   21,900,000   $ 21,900,000
Impairment 0 0 0 0  
Monashee          
Gain (Loss) on Securities [Line Items]          
Our total equity balance   21,900,000   21,900,000  
Loans and other receivables          
Gain (Loss) on Securities [Line Items]          
Transfers of assets from Level 2 to Level 3 15,900,000 11,400,000 27,100,000 6,100,000  
Transfers of assets from Level 3 to Level 2 21,500,000 6,200,000 54,100,000    
Net gains (losses) on Level 3 assets (realized and unrealized) (7,236,000) 1,255,000 (5,759,000) (39,831,000)  
Corporate equity securities          
Gain (Loss) on Securities [Line Items]          
Transfers of assets from Level 2 to Level 3 11,100,000 5,400,000 30,300,000    
Transfers of assets from Level 3 to Level 2   2,500,000 50,700,000 3,600,000  
Net gains (losses) on Level 3 assets (realized and unrealized) 8,245,000 (12,751,000) 9,940,000 (12,817,000)  
Total gains/(losses) (realized and unrealized) (256,000) 8,000 126,000 1,000  
Other ABS          
Gain (Loss) on Securities [Line Items]          
Transfers of assets from Level 2 to Level 3 2,100,000 61,900,000 3,300,000 47,600,000  
Transfers of assets from Level 3 to Level 2 2,000,000 6,300,000 4,400,000 7,400,000  
Net gains (losses) on Level 3 assets (realized and unrealized) 6,814,000 (2,198,000) (264,000) (5,913,000)  
Consumer and other loans          
Gain (Loss) on Securities [Line Items]          
Transfers of assets from Level 2 to Level 3 1,600,000        
Investments at fair value          
Gain (Loss) on Securities [Line Items]          
Transfers of assets from Level 3 to Level 2 10,000,000   10,000,000    
Collateralized debt obligations and collateralized loan obligations          
Gain (Loss) on Securities [Line Items]          
Transfers of assets from Level 2 to Level 3     3,000,000.0 2,700,000  
Transfers of assets from Level 3 to Level 2 8,000,000 4,500,000 8,400,000 5,100,000  
Net gains (losses) on Level 3 assets (realized and unrealized) (4,123,000) 1,220,000 (10,286,000) 9,006,000  
Net derivatives          
Gain (Loss) on Securities [Line Items]          
Transfers of liabilities from Level 2 to Level 3 2,000,000.0 15,900,000 3,900,000 23,200,000  
Transfers of liabilities from Level 3 to Level 2 5,700,000 13,400,000 14,500,000 13,700,000  
Total gains/(losses) (realized and unrealized) (1,132,000) (10,062,000) (13,925,000) (17,979,000)  
Structured Notes          
Gain (Loss) on Securities [Line Items]          
Transfers of liabilities from Level 2 to Level 3 13,200,000 32,800,000 3,900,000 38,700,000  
Transfers of liabilities from Level 3 to Level 2 5,100,000 30,100,000 28,800,000 34,700,000  
Corporate debt securities          
Gain (Loss) on Securities [Line Items]          
Transfers of assets from Level 2 to Level 3   17,300,000 8,000,000.0 2,600,000  
Transfers of assets from Level 3 to Level 2       2,000,000.0  
Net gains (losses) on Level 3 assets (realized and unrealized) 2,547,000 1,363,000 2,147,000 3,830,000  
Total gains/(losses) (realized and unrealized) 222,000 (23,000) 52,000 (23,000)  
Residential mortgage-backed securities          
Gain (Loss) on Securities [Line Items]          
Transfers of assets from Level 3 to Level 2       14,600,000  
Net gains (losses) on Level 3 assets (realized and unrealized) 436,000 $ (6,000) $ 269,000 $ (207,000)  
Total gains/(losses) (realized and unrealized) $ (15,000)