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Securities Sold under Agreements to Repurchase (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Securities sold under agreements to repurchase	$ 546.6	$ 885.1
Average Balance During the Year	$ 649.5	$ 989.6
Average Interest Rate Paid During the Year	0.05%	0.04%
Maximum Month-End Balance During the Year	$ 802.4	$ 1,038.1

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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