Commitments, Contingencies And Guarantees (Credit Exposure From Loan Commitments) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015
Commitments And Guarantee Obligations [Line Items]
0 - 12 Months	$ 128.0
1 -5 Years	810.6
Total Corporate Lending Exposure	938.6	[1]
Corporate Lending Exposure at Fair Value	235.1	[2]
Corporate Lending Commitments	703.5	[3]
Corporate lending exposure at fair value of funded loans included in trading assets	262.0
Corporate lending commitments carried at fair value included in trading liabilities	26.9
Non-investment grade [Member]
Commitments And Guarantee Obligations [Line Items]
1 -5 Years	167.6
Total Corporate Lending Exposure	167.6	[1]
Corporate Lending Exposure at Fair Value	2.8	[2]
Corporate Lending Commitments	164.8	[3]
Unrated [Member]
Commitments And Guarantee Obligations [Line Items]
0 - 12 Months	128.0
1 -5 Years	643.0
Total Corporate Lending Exposure	771.0	[1]
Corporate Lending Exposure at Fair Value	232.3	[2]
Corporate Lending Commitments	$ 538.7	[3]

[1] Total corporate lending exposure represents the potential loss assuming the fair value of funded loans and lending commitments were zero.

[2] The corporate lending exposure at fair value includes $262.0 million of funded loans included in Trading assets and a $26.9 million net liability related to lending commitments recorded in Trading liabilities in the Consolidated Statement of Financial Condition as of March 31, 2015.

[3] Amounts represent the notional amount of unfunded lending commitments.