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Commitments, Contingencies and Guarantees - Commitments and Contingencies (Detail)
$ in Millions
Feb. 29, 2016
USD ($)
Other Commitments [Line Items]  
2016 $ 1,480.8
2017 809.8
2018 and 2019 1,019.3
2020 and 2021 17.0
2022 and Later 273.5
Notional/ Maximum Payout 3,600.4
Equity commitments [Member]  
Other Commitments [Line Items]  
2016 1.5
2017 7.9
2018 and 2019 0.0
2020 and 2021 11.5
2022 and Later 238.5
Notional/ Maximum Payout 259.4
Loan commitments [Member]  
Other Commitments [Line Items]  
2016 2.5
2017 330.8
2018 and 2019 55.9
2020 and 2021 0.0
2022 and Later 0.0
Notional/ Maximum Payout 389.2
Mortgage-related and other purchase commitments [Member]  
Other Commitments [Line Items]  
2016 1,352.2
2017 255.3
2018 and 2019 926.4
2020 and 2021 0.0
2022 and Later 0.0
Notional/ Maximum Payout 2,533.9
Forward starting reverse repos and repos [Member]  
Other Commitments [Line Items]  
2016 77.1
2017 0.0
2018 and 2019 0.0
2020 and 2021 0.0
2022 and Later 0.0
Notional/ Maximum Payout 77.1
Other unfunded commitments [Member]  
Other Commitments [Line Items]  
2016 47.5
2017 215.8
2018 and 2019 37.0
2020 and 2021 5.5
2022 and Later 35.0
Notional/ Maximum Payout $ 340.8