Commitments, Contingencies and Guarantees - Commitments and Contingencies (Detail) $ in Millions	12 Months Ended
	Nov. 30, 2016 USD ($)
Commitments And Guarantee Obligations [Line Items]
2017	$ 7,862.7
2018	57.5
2019 and 2020	87.7
2021 and 2022	77.8
2023 and Later	247.2
Notional/ Maximum Payout	$ 8,332.9
Guarantor obligation settled period	3 days
Equity commitments [Member]
Commitments And Guarantee Obligations [Line Items]
2017	$ 0.8
2018	8.6
2019 and 2020	11.3
2021 and 2022	0.0
2023 and Later	234.0
Notional/ Maximum Payout	254.7
Loan commitments [Member]
Commitments And Guarantee Obligations [Line Items]
2017	304.6
2018	11.9
2019 and 2020	71.6
2021 and 2022	44.0
2023 and Later	0.0
Notional/ Maximum Payout	432.1
Underwriting commitments [Member]
Commitments And Guarantee Obligations [Line Items]
2017	349.4
2018	0.0
2019 and 2020	0.0
2021 and 2022	0.0
2023 and Later	0.0
Notional/ Maximum Payout	349.4
Forward starting reverse repos [Member]
Commitments And Guarantee Obligations [Line Items]
2017	4,668.7
2018	0.0
2019 and 2020	0.0
2021 and 2022	0.0
2023 and Later	0.0
Notional/ Maximum Payout	4,668.7
Guarantor obligation settled amount	4,592.9
Forward starting repos [Member]
Commitments And Guarantee Obligations [Line Items]
2017	2,539.2
2018	0.0
2019 and 2020	0.0
2021 and 2022	0.0
2023 and Later	0.0
Notional/ Maximum Payout	2,539.2
Guarantor obligation settled amount	2,464.6
Other unfunded commitments [Member]
Commitments And Guarantee Obligations [Line Items]
2017	0.0
2018	37.0
2019 and 2020	4.8
2021 and 2022	33.8
2023 and Later	13.2
Notional/ Maximum Payout	$ 88.8