Securities Sold under Agreements to Repurchase (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Securities Sold under Agreements to Repurchase [Abstract]
Securities sold under agreements to repurchase	$ 512.0	$ 358.1

- Definition

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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