Securitization Activities (Summary of Retained Interests in SPEs) (Details) - USD ($) $ in Millions	May 31, 2020	Nov. 30, 2019
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	$ 1,028.5	$ 10,671.7
Retained Interests	55.6	103.3
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	672.3	1,374.8
Retained Interests	55.2	45.8
CLOs
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
CLOs	1,468.1	3,006.7
Retained Interests	121.6	58.4
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	707.6	1,149.3
Retained Interests	$ 67.5	$ 71.8