Variable Interest Entities - Additional Information (Details) - USD ($) $ in Millions	Feb. 29, 2020	Nov. 30, 2019
Related party private equity vehicles | JCP Entities
Variable Interest Entity [Line Items]
Equity investments	$ 133.0	$ 133.0
Funded equity commitments	121.9	121.7
Carrying amount of equity investment	23.8	23.0
Other investment vehicles
Variable Interest Entity [Line Items]
Equity investments	698.5	398.6
Funded equity commitments	691.1	390.8
Carrying amount of equity investment	730.7	404.1
Agency mortgage-backed securities
Variable Interest Entity [Line Items]
Carrying amount	1,487.0	1,453.5
Non-agency mortgage and other asset-backed securities
Variable Interest Entity [Line Items]
Carrying amount	$ 130.3	$ 134.8