Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Noninterest Income
Trust, Investment and Other Servicing Fees	$ 1,003.6	$ 928.9
Foreign Exchange Trading Income	88.9	66.2
Treasury Management Fees	11.0	11.7
Security Commissions and Trading Income	41.7	23.3
Other Operating Income	34.4	29.0
Investment Security Gains (Losses), net (Note)	0.0	(0.2)
Total Noninterest Income	1,179.6	1,058.9
Net Interest Income
Interest Income	529.2	662.8
Interest Expense	121.1	240.8
Net Interest Income	408.1	422.0
Provision for Credit Losses	61.0	0.0
Net Interest Income after Provision for Credit Losses	347.1	422.0
Noninterest Expense
Compensation	499.8	482.0
Employee Benefits	97.9	85.7
Outside Services	192.8	188.4
Equipment and Software	162.2	148.3
Occupancy	51.1	51.6
Other Operating Expense	61.8	72.7
Total Noninterest Expense	1,065.6	1,028.7
Income before Income Taxes	461.1	452.2
Provision for Income Taxes	100.5	105.1
Net Income	360.6	347.1
Preferred Stock Dividends	30.5	17.3
Net Income Applicable to Common Stock	$ 330.1	$ 329.8
Per Common Share
Net Income — Basic (in dollars per share)	$ 1.56	$ 1.49
Net Income — Diluted (in dollars per share)	$ 1.55	$ 1.48
Average Number of Common Shares Outstanding
Average Number of Common Shares Outstanding — Basic (in shares)	208,881,131	218,236,802
Average Number of Common Shares Outstanding — Diluted (in shares)	209,816,822	219,270,215
Changes in other-than-temporary-impairment (OTTI) losses prior to the adoption of ASU 2016-13	$ 0.0	$ 0.0
Other Security Gains (Losses), net	0.0	(0.2)
Investment Security Gains (Losses), net (Note)	$ 0.0	$ (0.2)