Shareholders' Equity - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Apr. 01, 2019	Dec. 31, 2018	Mar. 11, 2016
Stockholders Equity [Line items]
Capital conservation buffer rate	2.50%			1.875%
Stock Repurchase Program
Stockholders Equity [Line items]
Repurchase shares of common stock	3,200,000
Repurchase shares of common stock, value	$ 100.0
Stock Repurchase Program | Common Stock [Member]
Stockholders Equity [Line items]
Amount of stock authorized for repurchase					$ 100.0
Repurchase shares of common stock	1,200,000	81,000
Repurchase shares of common stock, value	$ 36.9	$ 2.5
New Stock Repurchase Program [Member] | Subsequent Event [Member]
Stockholders Equity [Line items]
Amount of stock authorized for repurchase			$ 100.0