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Securities Purchased under Agreements to Resell (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Securities Financing Transaction [Line Items]
Balance at End of Year	$ 1,000.0	$ 500.0
Average Balance During the Year	742.1	396.3
Average Interest Rate Earned During the Year	0.45%	0.46%
Maximum Month-End Balance During the Year	$ 1,000.0	$ 571.5

Amount, after the effects of master netting arrangements, of funds outstanding loaned 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 purchases of participations in pools of securities that are subject to a resale agreement, assets not subject to a master netting arrangement and not elected to be offset.

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