Credit Quality Indicators (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	$ 28,691.4	$ 28,132.0
Commercial \| Below Average Risk
Financing Receivable, Recorded Investment [Line Items]
Commercial and Institutional	3,273.0	2,821.5
Commercial Real Estate	1,291.6	1,232.8
Lease Financing, net	536.6	571.6
Non-U.S.	612.5	430.0
Other	400.4	209.5
Total Loans and Leases	6,114.1	5,265.4
Personal \| Below Average Risk
Financing Receivable, Recorded Investment [Line Items]
Residential Real Estate	2,739.1	2,896.0
Private Client	3,059.1	3,326.5
Other	120.1	78.1
Total Loans and Leases	5,918.3	6,300.6
Below Average Risk
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	12,032.4	11,566.0
Commercial \| Average Risk
Financing Receivable, Recorded Investment [Line Items]
Commercial and Institutional	2,974.6	2,849.8
Commercial Real Estate	1,362.8	1,594.3
Lease Financing, net	464.1	473.0
Non-U.S.	687.3	596.5
Other	73.4	137.1
Total Loans and Leases	5,562.2	5,650.7
Personal \| Average Risk
Financing Receivable, Recorded Investment [Line Items]
Residential Real Estate	7,631.8	7,586.9
Private Client	2,335.4	2,064.1
Other	151.9	161.9
Total Loans and Leases	10,119.1	9,812.9
Average Risk
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	15,681.3	15,463.6
Commercial \| Watch List
Financing Receivable, Recorded Investment [Line Items]
Commercial and Institutional	210.4	243.2
Commercial Real Estate	303.8	415.3
Lease Financing, net	13.4	19.1
Non-U.S.	15.4	19.7
Total Loans and Leases	543.0	697.3
Personal \| Watch List
Financing Receivable, Recorded Investment [Line Items]
Residential Real Estate	401.5	372.0
Private Client	33.2	33.1
Total Loans and Leases	434.7	405.1
Watch List
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	977.7	1,102.4
Commercial
Financing Receivable, Recorded Investment [Line Items]
Commercial and Institutional	6,458.0	5,914.5
Commercial Real Estate	2,958.2	3,242.4
Lease Financing, net	1,014.1	1,063.7
Non-U.S.	1,315.2	1,046.2
Other	473.8	346.6
Total Loans and Leases	12,219.3	11,613.4
Personal
Financing Receivable, Recorded Investment [Line Items]
Residential Real Estate	10,772.4	10,854.9
Private Client	5,427.7	5,423.7
Other	272.0	240.0
Total Loans and Leases	$ 16,472.1	$ 16,518.6

The total gross amount of commercial loans (money lent to commercial entities rather than consumers) made in the form of direct financing leases where the reporting entity (lessor) only recognizes interest revenue from the lease. It also includes the amount of lease financing arising from involvement with leveraged lease transactions where the Entity is in the position of long-term creditor.

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-Glossary Leveraged Lease

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+ Details

- Definition

Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, after deducting deferred income, but before deducting the allowance for losses on loans and leases.

+ References+ Details

- Definition

Reflects the sum of the gross carrying amounts of unpaid loans issued to businesses to provide financing for cash needs, financial asset purchases, or farm-related purposes. Includes all loans not included in another category. This category includes, but is not limited to, loans to real estate investment trusts; mortgage companies, banks, and other financial institutions; loans for carrying securities; and loans for agricultural purposes. This element does not include loans secured primarily by developed real estate.

+ References

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+ Details

- Definition

Reflects the sum of the gross carrying amounts of unpaid loans issued to businesses to acquire, develop, construct, improve, or refinance land or a building. Includes [but is not limited to] commercial mortgage loans, which are secured by a [legal] security interest in real property [commercial building or business real property] which thereby serves as collateral securing repayment of the loan; and construction financing, which is an obligation generally in the form of a [promissory] note, used for the funding of construction projects.

+ References

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