Shareholders' Equity - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Apr. 01, 2020	Apr. 01, 2019	Mar. 11, 2016
Stockholders Equity [Line items]
Capital conservation buffer rate	2.50%	1.875%
Dividend potential for next fiscal year	$ 56.8
Period for which retained net income considered for approval	2 years
Stock Repurchase Program 1 [Member] | Common Stock [Member]
Stockholders Equity [Line items]
Amount of stock authorized for repurchase						$ 100.0
Repurchase shares of common stock	1,200,000	2,000,000.0	0
Repurchase shares of common stock, value	$ 36.9	$ 62.4
2016 Program [Member]
Stockholders Equity [Line items]
Repurchase shares of common stock	3,200,000
Repurchase shares of common stock, value	$ 100.0
Stock Repurchase Program 2 [Member]
Stockholders Equity [Line items]
Amount of stock authorized for repurchase					$ 100.0
Stock Repurchase Program 2 [Member] | Common Stock [Member]
Stockholders Equity [Line items]
Repurchase shares of common stock	601,000
Repurchase shares of common stock, value	$ 19.7
Stock Repurchase Program | Common Stock [Member]
Stockholders Equity [Line items]
Repurchase shares of common stock	1,800,000
Repurchase shares of common stock, value	$ 56.6
Stock Repurchase Program 3 [Member] | Scenario Forecast [Member]
Stockholders Equity [Line items]
Amount of stock authorized for repurchase				$ 100.0