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Fair Value Disclosures - Narrative (Details) - USD ($)
 12 Months Ended
Nov. 30, 2024
Nov. 30, 2023
Nov. 30, 2022
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Transfers of assets from Level 2 to Level 3 $ 90,500,000 $ 88,500,000 $ 111,700,000
Transfers of assets from Level 3 to Level 2 66,900,000 78,200,000 61,500,000
Transfers of liabilities from Level 2 to Level 3 30,100,000 60,800,000 172,100,000
Transfers of liabilities from Level 3 to Level 2 40,400,000 62,000,000.0 53,600,000
Net gains/(losses) on Level 3 assets (realized and unrealized) (52,000,000.0) 38,500,000 31,800,000
Total gains/(losses) (realized and unrealized) 47,100,000 62,900,000 (465,700,000)
Value of asset excluded from significant unobservable inputs 23,900,000 45,600,000  
Value of liability excluded from significant unobservable inputs 2,700,000 4,000,000.0  
Aggregate fair value of loans and other receivables on nonaccrual status and/or 90 days or greater past due 126,900,000 98,100,000  
Loan and other receivables greater than 90 days past due 120,000,000.0 37,600,000  
Equity securities without readily determinable fair value 21,900,000 0  
Realized investment gains (losses) 0 (122,200,000) 3,600,000
Impairment (80,300,000) 0 0
Other ABS      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Transfers of assets from Level 2 to Level 3 47,600,000 57,800,000 22,600,000
Transfers of assets from Level 3 to Level 2 19,000,000.0 24,300,000 29,300,000
Net gains/(losses) on Level 3 assets (realized and unrealized) (22,251,000) (17,800,000) (6,467,000)
Loans and other receivables      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Transfers of assets from Level 2 to Level 3 14,900,000 16,500,000 33,200,000
Transfers of assets from Level 3 to Level 2 8,100,000 32,400,000 4,500,000
Net gains/(losses) on Level 3 assets (realized and unrealized) (1,664,000) 10,995,000 (1,912,000)
Corporate debt securities      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Transfers of assets from Level 2 to Level 3 2,000,000.0 8,900,000 22,800,000
Net gains/(losses) on Level 3 assets (realized and unrealized) (4,442,000) 1,749,000 946,000
Total gains/(losses) (realized and unrealized) (3,000) (35,000) 88,000
Corporate equity securities      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Transfers of assets from Level 2 to Level 3 22,700,000 5,300,000 17,900,000
Transfers of assets from Level 3 to Level 2 9,700,000 6,000,000.0 4,300,000
Transfers of liabilities from Level 3 to Level 2     4,300,000
Net gains/(losses) on Level 3 assets (realized and unrealized) (4,616,000) (65,037,000) (645,000)
Total gains/(losses) (realized and unrealized) 682,000 348,000 (3,611,000)
Collateralized debt obligations and collateralized loan obligations      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Transfers of assets from Level 2 to Level 3 2,700,000   11,000,000.0
Transfers of assets from Level 3 to Level 2 8,200,000 14,000,000.0  
Net gains/(losses) on Level 3 assets (realized and unrealized) (6,194,000) 31,218,000 7,099,000
Net derivatives      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Transfers of liabilities from Level 2 to Level 3 3,100,000 35,600,000 152,800,000
Transfers of liabilities from Level 3 to Level 2 13,600,000 32,000,000.0 7,500,000
Total gains/(losses) (realized and unrealized) (9,648,000) (10,405,000) (181,750,000)
Structured notes      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Transfers of liabilities from Level 2 to Level 3 26,800,000 25,200,000 19,300,000
Transfers of liabilities from Level 3 to Level 2 27,800,000 29,800,000 38,900,000
Investments at Fair Value      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Transfers of assets from Level 3 to Level 2     23,400,000
Residential mortgage-backed securities      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Transfers of assets from Level 3 to Level 2 14,600,000    
Net gains/(losses) on Level 3 assets (realized and unrealized) $ (669,000) $ (5,709,000) $ (13,210,000)