Commitments, Contingencies And Guarantees (Commitments And Contingencies) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014
Commitments And Guarantee Obligations [Line Items]
2014	$ 2,953.1
2015	496.8
2016 and 2017	1,147.3
2018 and 2019	101.1
2020 and Later	378.7
Maximum Payout	5,077.0
Equity Commitments [Member]
Commitments And Guarantee Obligations [Line Items]
2014	1.6	[1]
2015	7.6	[1]
2016 and 2017	0.9	[1]
2020 and Later	355.7	[1]
Maximum Payout	365.8	[1]
Loan Commitments [Member]
Commitments And Guarantee Obligations [Line Items]
2015	76.7	[1]
2016 and 2017	615.8	[1]
2018 and 2019	101.1	[1]
Maximum Payout	793.6	[1]
Mortgage-Related Commitments [Member]
Commitments And Guarantee Obligations [Line Items]
2014	976.2
2015	333.0
2016 and 2017	530.6
Maximum Payout	1,839.8
Forward Starting Reverse Repos And Repos [Member]
Commitments And Guarantee Obligations [Line Items]
2014	1,975.3
Maximum Payout	1,975.3
Other Unfunded Commitments [Member]
Commitments And Guarantee Obligations [Line Items]
2015	79.5	[1]
2020 and Later	23.0	[1]
Maximum Payout	$ 102.5	[1]

[1] Equity, loan commitments and other unfunded commitments are presented by contractual maturity date. The amounts are however available on demand.