Securitization Activities - Summary of Retained Interests in SPEs (Details) - USD ($) $ in Millions	Aug. 31, 2022	Nov. 30, 2021
Debt and Equity Securities, FV-NI [Line Items]
Total RMBS securitization assets	$ 238.9	$ 330.2
Total CMBS securitization assets	2,537.7	2,201.8
CLOs	5,610.2	3,382.3
Consumer and other loans	2,337.7	2,271.4
U.S. government agency RMBS
Debt and Equity Securities, FV-NI [Line Items]
Retained Interests	3.5	4.9
U.S. government agency CMBS
Debt and Equity Securities, FV-NI [Line Items]
Retained Interests	174.7	69.2
CLOs
Debt and Equity Securities, FV-NI [Line Items]
Retained Interests	42.0	31.0
Consumer and other loans
Debt and Equity Securities, FV-NI [Line Items]
Retained Interests	$ 122.3	$ 136.4