Securitization Activities - Summary of Retained Interests in SPEs (Details) - USD ($) $ in Millions	Nov. 30, 2022	Nov. 30, 2021
Securitization Vehicles [Line Items]
Total RMBS securitization assets	$ 219.8	$ 330.2
Total CMBS securitization assets	2,997.7	2,201.8
Total collateralized loan obligations	5,140.5	3,382.3
Consumer and other loans	2,526.7	2,271.4
U.S. government agency RMBS
Securitization Vehicles [Line Items]
Retained Interests	2.9	4.9
U.S. government agency CMBS
Securitization Vehicles [Line Items]
Retained Interests	173.9	69.2
CLOs
Securitization Vehicles [Line Items]
Retained Interests	31.9	31.0
Consumer and other loans
Securitization Vehicles [Line Items]
Retained Interests	$ 122.8	$ 136.4