Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Noninterest Income
Trust, Investment and Other Servicing Fees	$ 1,003.8	$ 975.5	$ 2,968.9	$ 2,859.9
Foreign Exchange Trading Income	61.6	59.7	221.8	186.4
Treasury Management Fees	11.6	11.2	34.0	34.1
Security Commissions and Trading Income	26.0	29.1	100.9	75.8
Other Operating Income	53.5	45.1	144.4	113.0
Investment Security Gains (Losses), net (Note)	0.0	(0.4)	0.1	(0.9)
Total Noninterest Income	1,156.5	1,120.2	3,470.1	3,268.3
Net Interest Income
Interest Income	355.4	620.8	1,290.9	1,923.8
Interest Expense	26.8	203.1	182.1	666.7
Net Interest Income	328.6	417.7	1,108.8	1,257.1
Provision for Credit Losses	0.5	(7.0)	127.5	(13.5)
Net Interest Income after Provision for Credit Losses	328.1	424.7	981.3	1,270.6
Noninterest Expense
Compensation	461.7	458.0	1,421.8	1,395.5
Employee Benefits	97.5	87.6	285.8	262.6
Outside Services	186.0	194.0	555.0	568.8
Equipment and Software	170.7	151.7	497.1	447.2
Occupancy	51.8	53.0	162.9	155.5
Other Operating Expense	127.0	92.0	274.6	241.6
Total Noninterest Expense	1,094.7	1,036.3	3,197.2	3,071.2
Income before Income Taxes	389.9	508.6	1,254.2	1,467.7
Provision for Income Taxes	95.4	124.0	285.8	346.6
Net Income	294.5	384.6	968.4	1,121.1
Preferred Stock Dividends	16.2	17.4	51.5	40.6
Net Income Applicable to Common Stock	$ 278.3	$ 367.2	$ 916.9	$ 1,080.5
Per Common Share
Net Income — Basic (in dollars per share)	$ 1.32	$ 1.70	$ 4.35	$ 4.95
Net Income - Diluted (in dollars per share)	$ 1.32	$ 1.69	$ 4.34	$ 4.92
Average number of common shares outstanding
Average Number of Common Shares Outstanding - Basic (in shares)	208,106,190	213,176,809	208,351,088	215,832,347
Average Number of Common Shares Outstanding - Diluted (in shares)	208,688,494	214,206,576	209,023,331	216,863,563
Note: Changes in Other-Than-Temporary-Impairment (OTTI) Losses prior to the adoption of ASU 2016-13	$ 0.0	$ (0.1)	$ 0.0	$ (0.3)
Other Security Gains (Losses), net	0.0	(0.3)	0.1	(0.6)
Investment Security Gains (Losses), net	$ 0.0	$ (0.4)	$ 0.1	$ (0.9)