Securitization Activities - Summary of Retained Interests in SPEs (Details) - USD ($) $ in Millions	Feb. 29, 2024	Nov. 30, 2023
Debt and Equity Securities, FV-NI [Line Items]
Total RMBS securitization assets	$ 5,636.6	$ 5,595.1
Total CMBS securitization assets	2,378.4	3,014.3
CLOs	7,106.6	6,323.8
Consumer and other loans	1,527.9	1,877.8
U.S. government agency RMBS
Debt and Equity Securities, FV-NI [Line Items]
Retained Interests	116.5	417.3
U.S. government agency CMBS
Debt and Equity Securities, FV-NI [Line Items]
Retained Interests	181.4	197.3
CLOs
Debt and Equity Securities, FV-NI [Line Items]
Retained Interests	32.9	23.3
Consumer and other loans
Debt and Equity Securities, FV-NI [Line Items]
Retained Interests	$ 61.8	$ 68.1