Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Noninterest Income
Trust, Investment and Other Servicing Fees	$ 4,361.8	$ 4,432.6	$ 4,361.1
Foreign Exchange Trading Income	203.9	288.6	292.6
Treasury Management Fees	31.6	39.3	44.3
Security Commissions and Trading Income	135.0	136.2	140.2
Other Operating Income	228.7	191.3	243.9
Investment Security Gains (Losses), net	(169.5)	(214.0)	(0.3)
Total Noninterest Income	4,791.5	4,874.0	5,081.8
Net Interest Income
Interest Income	7,325.0	2,877.7	1,406.5
Interest Expense	5,343.0	990.5	23.8
Net Interest Income	1,982.0	1,887.2	1,382.7
Provision for Credit Losses	24.5	12.0	(81.5)
Net Interest Income after Provision for Credit Losses	1,957.5	1,875.2	1,464.2
Noninterest Expense
Compensation	2,321.8	2,248.0	2,011.0
Employee Benefits	405.2	437.4	431.4
Outside Services	906.5	880.3	849.4
Equipment and Software	945.5	838.8	736.3
Occupancy	232.3	219.1	208.7
Other Operating Expense	472.9	359.3	299.1
Total Noninterest Expense	5,284.2	4,982.9	4,535.9
Income before Income Taxes	1,464.8	1,766.3	2,010.1
Provision for Income Taxes	357.5	430.3	464.8
NET INCOME	1,107.3	1,336.0	1,545.3
Preferred Stock Dividends	41.8	41.8	41.8
Net Income Applicable to Common Stock	$ 1,065.5	$ 1,294.2	$ 1,503.5
PER COMMON SHARE
Net Income - Basic (in dollars per share)	$ 5.09	$ 6.16	$ 7.16
Net Income - Diluted (in dollars per share)	$ 5.08	$ 6.14	$ 7.14
Average Number of Common Shares Outstanding - Basic (in shares)	207,248,094	208,309,331	208,075,522
Average Number of Common Shares Outstanding - Diluted (in shares)	207,563,746	208,867,264	208,899,230