Variable Interest Entities - Additional Information (Detail) - USD ($) $ in Millions	May 31, 2018	Nov. 30, 2017
Variable Interest Entity [Line Items]
Maximum exposure	$ 299.5
Related party private equity vehicles | JCP Entities
Variable Interest Entity [Line Items]
Equity investments	144.7	$ 148.1
Funded equity commitments	126.5	126.3
Carrying amount of equity investment	33.8	23.7
Other private investment vehicles
Variable Interest Entity [Line Items]
Equity investments	64.8	61.8
Funded equity commitments	61.5	61.0
Carrying amount of equity investment	49.0	48.0
ERROR in label resolution.
Variable Interest Entity [Line Items]
Carrying amount	2,898.7	1,829.6
ERROR in label resolution.
Variable Interest Entity [Line Items]
Carrying amount	$ 189.6	$ 253.2