Investments - JCP Fund V - Narrative (Details) - JCP Fund V - USD ($) $ in Millions	9 Months Ended
	Aug. 31, 2017	Nov. 30, 2016
Schedule of Equity Method Investments [Line Items]
Investments in managed funds	$ 21.2	$ 29.1
Unfunded portion of equity commitment to subsidiary	$ 10.1	11.3
Percent of financial information presented	100.00%
Ownership percentage	35.20%
Maximum
Schedule of Equity Method Investments [Line Items]
Total committed equity capitalization	$ 85.0	$ 85.0