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Securities Sold under Agreements to Repurchase (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Securities Financing Transaction [Line Items]
Balance at Ending of Year	$ 885.1	$ 917.3
Average Balance During the Year	989.6	594.3
Average Interest Rate Paid During the Year	0.04%	0.07%
Maximum Month-End Balance During the Year	$ 1,038.1	$ 917.3

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

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