Securitization Activities - Summary of Retained Interests in SPEs (Details) - USD ($) $ in Millions	Feb. 28, 2021	Nov. 30, 2020
U.S. government agency residential mortgage-backed securities
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
U.S. government agency residential mortgage-backed securities	$ 505.5	$ 562.5
Retained Interests	6.8	7.8
U.S. government agency commercial mortgage-backed securities
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
U.S. government agency commercial mortgage-backed securities	2,051.0	2,461.2
Retained Interests	102.3	205.2
CLOs
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
CLOs	5,712.5	3,345.5
Retained Interests	70.2	39.5
Consumer and other loans
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Consumer and other loans	1,428.9	1,290.6
Retained Interests	$ 77.8	$ 56.6