Shareholders' Equity and Other Comprehensive Income - Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions			12 Months Ended
	Jul. 01, 2019	Jun. 21, 2018	Dec. 31, 2023
Preferred Stock
Class of Stock [Line Items]
Redemption period from regulatory capital treatment			90 days
Redemption price per share (in dollars per share)			$ 25
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D
Class of Stock [Line Items]
Proceeds from issuance of stock		$ 200.0
Net Proceeds		$ 195.1
Liquidation preference (in dollars per share)		$ 25
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D | Up to and Excluding June 21, 2023
Class of Stock [Line Items]
Dividend rate, percentage		6.30%
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D | From and Including June 21, 2023
Class of Stock [Line Items]
Dividend rate, percentage		3.352%
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D | Beyond June 30, 2023
Class of Stock [Line Items]
Dividend rate, percentage		3.614%
Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series E
Class of Stock [Line Items]
Proceeds from issuance of stock	$ 350.0
Net Proceeds	$ 342.0
Liquidation preference (in dollars per share)	$ 25
Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series E | Until July 1, 2024 (Excluding July 1, 2024)
Class of Stock [Line Items]
Dividend rate, percentage	5.875%
Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series E | From July 1, 2024 (Including July 1, 2024)
Class of Stock [Line Items]
Dividend rate, percentage	4.127%