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Commitments, Contingencies and Guarantees - Commitments and Contingencies (Detail)
$ in Millions
Aug. 31, 2016
USD ($)
Other Commitments [Line Items]  
2016 $ 1,071.6
2017 943.3
2018 and 2019 1,374.2
2020 and 2021 92.4
2022 and Later 246.0
Notional/ Maximum Payout 3,727.5
Equity commitments [Member]  
Other Commitments [Line Items]  
2016 1.5
2017 7.9
2018 and 2019 0.0
2020 and 2021 11.3
2022 and Later 213.7
Notional/ Maximum Payout 234.4
Loan commitments [Member]  
Other Commitments [Line Items]  
2016 0.0
2017 306.4
2018 and 2019 82.2
2020 and 2021 54.4
2022 and Later 0.0
Notional/ Maximum Payout 443.0
Mortgage-related and other purchase commitments [Member]  
Other Commitments [Line Items]  
2016 838.0
2017 263.2
2018 and 2019 1,265.2
2020 and 2021 21.6
2022 and Later 0.0
Notional/ Maximum Payout 2,388.0
Underwriting commitments [Member]  
Other Commitments [Line Items]  
2016 0.0
2017 223.2
2018 and 2019 0.0
2020 and 2021 0.0
2022 and Later 0.0
Notional/ Maximum Payout 223.2
Forward starting reverse repos and repos [Member]  
Other Commitments [Line Items]  
2016 166.3
2017 0.0
2018 and 2019 0.0
2020 and 2021 0.0
2022 and Later 0.0
Notional/ Maximum Payout 166.3
Other unfunded commitments [Member]  
Other Commitments [Line Items]  
2016 65.8
2017 142.6
2018 and 2019 26.8
2020 and 2021 5.1
2022 and Later 32.3
Notional/ Maximum Payout $ 272.6