Shareholders' Equity - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended	37 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2020	Apr. 01, 2020	Dec. 31, 2019	Apr. 01, 2019	Mar. 11, 2016
Stockholders Equity [Line items]
Capital conservation buffer rate					2.50%		2.50%
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		3,200,000
Repurchase shares of common stock, value		$ 36.9		$ 100.0
Stock Repurchase Program 2 [Member] | Common Stock [Member]
Stockholders Equity [Line items]
Amount of stock authorized for repurchase								$ 100.0
Repurchase shares of common stock	887,000		1,500,000
Repurchase shares of common stock, value	$ 27.5		$ 47.2
Stock Repurchase Program 3 [Member] | Common Stock [Member]
Stockholders Equity [Line items]
Amount of stock authorized for repurchase						$ 100.0