Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Noninterest Income
Trust, Investment and Other Servicing Fees	$ 975.5	$ 939.2	$ 2,859.9	$ 2,819.8
Foreign Exchange Trading Income	59.7	71.7	186.4	229.1
Treasury Management Fees	11.2	12.5	34.1	40.0
Security Commissions and Trading Income	29.1	21.9	75.8	75.2
Other Operating Income	45.1	20.9	113.0	87.1
Investment Security Gains (Losses), net (Note)	(0.4)	(0.1)	(0.9)	(0.3)
Total Noninterest Income	1,120.2	1,066.1	3,268.3	3,250.9
Net Interest Income
Interest Income	620.8	599.2	1,923.8	1,672.8
Interest Expense	203.1	191.0	666.7	467.3
Net Interest Income	417.7	408.2	1,257.1	1,205.5
Provision for Credit Losses	(7.0)	(9.0)	(13.5)	(10.5)
Net Interest Income after Provision for Credit Losses	424.7	417.2	1,270.6	1,216.0
Noninterest Expense
Compensation	458.0	436.1	1,395.5	1,362.5
Employee Benefits	87.6	85.5	262.6	266.0
Outside Services	194.0	186.9	568.8	543.9
Equipment and Software	151.7	145.7	447.2	429.9
Occupancy	53.0	51.0	155.5	151.3
Other Operating Expense	92.0	97.1	241.6	241.4
Total Noninterest Expense	1,036.3	1,002.3	3,071.2	2,995.0
Income before Income Taxes	508.6	481.0	1,467.7	1,471.9
Provision for Income Taxes	124.0	106.5	346.6	325.4
Net Income	384.6	374.5	1,121.1	1,146.5
Preferred Stock Dividends	17.4	17.3	40.6	40.5
Net Income Applicable to Common Stock	$ 367.2	$ 357.2	$ 1,080.5	$ 1,106.0
Per Common Share
Net Income — Basic (in dollars per share)	$ 1.70	$ 1.59	$ 4.95	$ 4.87
Net Income - Diluted (in dollars per share)	$ 1.69	$ 1.58	$ 4.92	$ 4.84
Average number of common shares outstanding
Average Number of Common Shares Outstanding - Basic (in shares)	213,176,809	222,442,797	215,832,347	224,098,656
Average Number of Common Shares Outstanding - Diluted (in shares)	214,206,576	223,860,014	216,863,563	225,494,635
Changes in other-than-temporary-impairment (OTTI) losses	$ (0.1)	$ (0.1)	$ (0.3)	$ (0.3)
Other Security Gains (Losses), net	(0.3)	0.0	(0.6)	0.0
Investment Security Gains (Losses), net (Note)	$ (0.4)	$ (0.1)	$ (0.9)	$ (0.3)