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Securities Sold under Agreements to Repurchase (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Securities Financing Transaction [Line Items]
Balance at Ending of Year	$ 917.3	$ 699.8
Average Balance During the Year	594.3	448.2
Average Interest Rate Paid During the Year	0.07%	0.08%
Maximum Month-End Balance During the Year	$ 917.3	$ 699.8

Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement.

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