Share Repurchases - Additional Information (Details) - USD ($) shares in Millions, $ in Millions	1 Months Ended		6 Months Ended
	Feb. 28, 2021	Dec. 31, 2020	Jun. 30, 2021	Nov. 01, 2017
Accelerated Share Repurchases [Line Items]
Stock repurchase program, authorized amount				$ 500.0
Commercial Bank
Accelerated Share Repurchases [Line Items]
Stock repurchase program, authorized amount		$ 270.0
Accelerated share repurchases, settlement payment		$ 300.0
Accelerated share repurchases received	0.4	3.1
Repurchase Program
Accelerated Share Repurchases [Line Items]
Stock repurchase program remaining authorized repurchase amount			$ 210.0
Evergreen Program
Accelerated Share Repurchases [Line Items]
Accelerated share repurchases received			3.5