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Securitization Activities - Summary of Retained Interests in SPEs (Details) - USD ($)
$ in Millions
Nov. 30, 2023
Nov. 30, 2022
Securitization Vehicles [Line Items]    
Total RMBS securitization assets $ 5,595.1 $ 219.8
Total CMBS securitization assets 3,014.3 2,997.7
Total collateralized loan obligations 6,323.8 5,140.5
Consumer and other loans 1,877.8 2,526.7
U.S. government agency RMBS    
Securitization Vehicles [Line Items]    
Retained Interests 417.3 2.9
U.S. government agency CMBS    
Securitization Vehicles [Line Items]    
Retained Interests 197.3 173.9
CLOs    
Securitization Vehicles [Line Items]    
Retained Interests 23.3 31.9
Consumer and other loans    
Securitization Vehicles [Line Items]    
Retained Interests $ 68.1 $ 122.8