Variable Interest Entities - Variable Interests in Non-Consolidated Variable Interest Entities (Detail) - Variable Interest Entity Not Primary Beneficiary [Member] - USD ($)
$ in Millions |
May 31, 2016 |
Nov. 30, 2015 |
| Variable Interest Entity [Line Items] |
|
|
| Carrying Amount, Assets |
$ 316.8
|
$ 352.5
|
| Carrying Amount, Liabilities |
5.9
|
0.2
|
| Maximum exposure to loss in non-consolidated VIEs |
1,273.1
|
1,422.5
|
| VIE Assets |
9,929.6
|
11,981.9
|
| Collateralized loan obligations [Member] |
|
|
| Variable Interest Entity [Line Items] |
|
|
| Carrying Amount, Assets |
60.2
|
73.6
|
| Carrying Amount, Liabilities |
5.8
|
0.2
|
| Maximum exposure to loss in non-consolidated VIEs |
439.0
|
458.1
|
| VIE Assets |
5,270.6
|
6,368.7
|
| Consumer Loan Vehicles [Member] |
|
|
| Variable Interest Entity [Line Items] |
|
|
| Carrying Amount, Assets |
166.6
|
188.3
|
| Carrying Amount, Liabilities |
0.0
|
0.0
|
| Maximum exposure to loss in non-consolidated VIEs |
716.5
|
845.8
|
| VIE Assets |
1,027.3
|
1,133.0
|
| Related party private equity vehicles [Member] |
|
|
| Variable Interest Entity [Line Items] |
|
|
| Carrying Amount, Assets |
32.0
|
39.3
|
| Carrying Amount, Liabilities |
0.1
|
0.0
|
| Maximum exposure to loss in non-consolidated VIEs |
58.1
|
65.8
|
| VIE Assets |
137.2
|
168.2
|
| Other private investment vehicles [Member] |
|
|
| Variable Interest Entity [Line Items] |
|
|
| Carrying Amount, Assets |
58.0
|
51.3
|
| Carrying Amount, Liabilities |
0.0
|
0.0
|
| Maximum exposure to loss in non-consolidated VIEs |
59.5
|
52.8
|
| VIE Assets |
$ 3,494.5
|
$ 4,312.0
|