Divestiture - Additional information (Detail) - Community Financial Services products - Discontinued Operations, Disposed of by Sale - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Mar. 03, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amount of consideration related to disposal		$ 200.0
Net after-tax gain on the sale of assets	$ 93.7
TSA | Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Migration period	18 months