Commitments, Contingencies and Guarantees - Commitments and Contingencies (Detail) $ in Millions	Nov. 30, 2015 USD ($)
Commitments And Guarantee Obligations [Line Items]
2016	$ 3,550.2
2017	670.1
2018 and 2019	1,115.3
2020 and 2021	21.5
2022 and Later	225.1
Notional/ Maximum Payout	5,582.2
Equity commitments [Member]
Commitments And Guarantee Obligations [Line Items]
2016	9.5
2017	0.0
2018 and 2019	0.0
2020 and 2021	15.8
2022 and Later	189.5
Notional/ Maximum Payout	214.8
Loan commitments [Member]
Commitments And Guarantee Obligations [Line Items]
2016	247.3
2017	170.7
2018 and 2019	81.4
2020 and 2021	0.0
2022 and Later	0.0
Notional/ Maximum Payout	499.4
Mortgage-related and other purchase commitments [Member]
Commitments And Guarantee Obligations [Line Items]
2016	1,571.4
2017	312.5
2018 and 2019	1,013.7
2020 and 2021	0.0
2022 and Later	0.0
Notional/ Maximum Payout	2,897.6
Forward starting reverse repos and repos [Member]
Commitments And Guarantee Obligations [Line Items]
2016	1,635.0
2017	0.0
2018 and 2019	0.0
2020 and 2021	0.0
2022 and Later	0.0
Notional/ Maximum Payout	1,635.0
Other unfunded commitments [Member]
Commitments And Guarantee Obligations [Line Items]
2016	87.0
2017	186.9
2018 and 2019	20.2
2020 and 2021	5.7
2022 and Later	35.6
Notional/ Maximum Payout	$ 335.4