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Fair Value Disclosures - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended
Aug. 31, 2024
Nov. 30, 2023
Aug. 31, 2023
Aug. 31, 2024
Aug. 31, 2023
Sep. 19, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Transfers of assets from Level 2 to Level 3 $ 31,300,000   $ 21,700,000 $ 61,000,000.0 $ 77,100,000  
Transfers of assets from Level 3 to Level 2 50,800,000   51,000,000.0 56,000,000.0 64,800,000  
Transfers of liabilities from Level 2 to Level 3 18,800,000   31,300,000 39,400,000 46,100,000  
Transfers of liabilities from Level 3 to Level 2 39,000,000.0   77,300,000 53,100,000 74,000,000.0  
Net gains/(losses) on Level 3 assets (realized and unrealized) (7,300,000)   42,900,000 (53,800,000) 69,400,000  
Total gains/losses (realized and unrealized) 16,500,000   27,500,000 23,300,000 31,700,000  
Value of asset excluded from significant unobservable inputs 24,600,000 $ 45,600,000   24,600,000    
Value of liability excluded from significant unobservable inputs 4,200,000 4,000,000.0   4,200,000    
Aggregate fair value of loans and other receivables on nonaccrual status and/or 90 days or greater past due 88,200,000 98,100,000   88,200,000    
Loans and other receivables greater than 90 days past due 76,400,000 37,600,000   76,400,000    
Investment, other than temporary impairment     27,800,000   57,200,000  
Gain from sale   1,700,000        
Equity securities without readily determinable fair value, amount 21,900,000 $ 0   21,900,000    
Realized and unrealized gains (loss)     (400,000)   (122,200,000)  
Equity securities without readily determinable fair value, impairment loss $ 0   400,000 $ 0 80,300,000  
Common shares, issued after deducting shares held in treasury (in shares) 205,495,338 210,626,642   205,495,338    
Sumitomo Mitsui Banking Corporation Agreement | Related Party | Subsequent event            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Common shares, issued after deducting shares held in treasury (in shares)           9,200,000
Monashee            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity method investments $ 21,900,000 $ 15,800,000   $ 21,900,000    
Other ABS            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Transfers of assets from Level 2 to Level 3 3,300,000   6,800,000 47,600,000 9,900,000  
Transfers of assets from Level 3 to Level 2 24,000,000.0   1,500,000 18,300,000 4,500,000  
Net gains/(losses) on Level 3 assets (realized and unrealized) (966,000)   (2,768,000) (7,724,000) (9,162,000)  
Corporate debt securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Transfers of assets from Level 2 to Level 3     3,200,000   8,700,000  
Transfers of assets from Level 3 to Level 2 7,100,000   14,500,000 7,500,000    
Net gains/(losses) on Level 3 assets (realized and unrealized) 93,000   (176,000) 3,060,000 2,087,000  
Total gains/losses (realized and unrealized) 0   1,000 (23,000) (40,000)  
Loans and other receivables            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Transfers of assets from Level 2 to Level 3 15,900,000   7,000,000.0 11,300,000 26,300,000  
Transfers of assets from Level 3 to Level 2 5,900,000   4,700,000 7,000,000.0 34,000,000.0  
Net gains/(losses) on Level 3 assets (realized and unrealized) (18,742,000)   6,776,000 (43,105,000) 4,626,000  
Corporate equity securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Transfers of assets from Level 2 to Level 3         3,300,000  
Transfers of assets from Level 3 to Level 2     4,600,000 3,300,000 5,600,000  
Net gains/(losses) on Level 3 assets (realized and unrealized) 9,887,000   (85,416,000) (3,969,000) (58,302,000)  
Total gains/losses (realized and unrealized) 4,000   0 5,000 (285,000)  
Residential mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Transfers of assets from Level 3 to Level 2       14,600,000    
Net gains/(losses) on Level 3 assets (realized and unrealized) 24,000   (1,796,000) (185,000) (4,239,000)  
Structured notes            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Transfers of liabilities from Level 2 to Level 3 9,600,000   21,700,000 18,800,000 27,900,000  
Transfers of liabilities from Level 3 to Level 2 30,200,000   39,100,000 34,900,000 29,200,000  
Net derivatives            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Transfers of liabilities from Level 2 to Level 3 9,300,000   6,500,000 23,200,000 12,600,000  
Transfers of liabilities from Level 3 to Level 2 8,800,000   37,800,000 18,200,000 44,800,000  
Total gains/losses (realized and unrealized) (7,588,000)   4,259,000 (17,212,000) (8,176,000)  
Commercial mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Transfers of assets from Level 2 to Level 3         28,900,000  
Net gains/(losses) on Level 3 assets (realized and unrealized) 15,000   (535,000) (16,000) (1,282,000)  
Total gains/losses (realized and unrealized) 0   (11,000) 0 (11,000)  
CDOs and CLOs            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Transfers of assets from Level 2 to Level 3 10,100,000   3,700,000      
Transfers of assets from Level 3 to Level 2 13,400,000   12,900,000 5,200,000 7,800,000  
Net gains/(losses) on Level 3 assets (realized and unrealized) 1,477,000   12,133,000 8,771,000 23,622,000  
Investments at fair value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Transfers of assets from Level 3 to Level 2     12,700,000   12,700,000  
Loans            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Transfers of liabilities from Level 2 to Level 3     3,000,000.0   5,700,000  
Total gains/losses (realized and unrealized) $ (1,000,000)   $ 2,522,000 $ 1,879,000 $ (124,000)