Securitization Activities - Retained Interests in SPEs (Details) - USD ($) $ in Millions	Feb. 28, 2025	Nov. 30, 2024
Securitization Vehicles [Line Items]
Total RMBS securitization assets	$ 3,125.7	$ 3,956.8
Total CMBS securitization assets	1,348.6	1,817.1
CLOs	9,083.5	9,001.9
Consumer and other loans	1,204.0	1,424.4
U.S. government agency RMBS
Securitization Vehicles [Line Items]
Retained Interests	29.7	105.7
U.S. government agency CMBS
Securitization Vehicles [Line Items]
Retained Interests	55.6	91.8
CLOs
Securitization Vehicles [Line Items]
Retained Interests	31.3	37.2
Consumer and other loans
Securitization Vehicles [Line Items]
Retained Interests	$ 36.1	$ 52.1