Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Noninterest Income
Trust, Investment and Other Servicing Fees	$ 955.5	$ 942.9	$ 1,884.4	$ 1,880.6
Foreign Exchange Trading Income	60.5	78.9	126.7	157.4
Treasury Management Fees	11.2	13.5	22.9	27.5
Security Commissions and Trading Income	23.4	26.1	46.7	53.3
Other Operating Income	38.9	31.4	67.9	66.2
Investment Security Gains (Losses), net (Note)	(0.3)	0.0	(0.5)	(0.2)
Total Noninterest Income	1,089.2	1,092.8	2,148.1	2,184.8
Net Interest Income
Interest Income	640.2	567.7	1,303.0	1,073.6
Interest Expense	222.8	154.4	463.6	276.3
Net Interest Income	417.4	413.3	839.4	797.3
Provision for Credit Losses	(6.5)	1.5	(6.5)	(1.5)
Net Interest Income after Provision for Credit Losses	423.9	411.8	845.9	798.8
Noninterest Expense
Compensation	455.5	454.7	937.5	926.4
Employee Benefits	89.3	88.8	175.0	180.5
Outside Services	186.4	185.6	374.8	357.0
Equipment and Software	147.2	144.2	295.5	284.2
Occupancy	50.9	48.8	102.5	100.3
Other Operating Expense	76.9	75.3	149.6	144.3
Total Noninterest Expense	1,006.2	997.4	2,034.9	1,992.7
Income before Income Taxes	506.9	507.2	959.1	990.9
Provision for Income Taxes	117.5	116.8	222.6	218.9
Net Income	389.4	390.4	736.5	772.0
Preferred Stock Dividends	5.9	5.9	23.2	23.2
Net Income Applicable to Common Stock	$ 383.5	$ 384.5	$ 713.3	$ 748.8
Per Common Share
Net Income — Basic (in dollars per share)	$ 1.76	$ 1.69	$ 3.25	$ 3.28
Net Income - Diluted (in dollars per share)	$ 1.75	$ 1.68	$ 3.23	$ 3.26
Average number of common shares outstanding
Average Number of Common Shares Outstanding - Basic (in shares)	216,139,033	224,207,590	217,182,123	224,940,308
Average Number of Common Shares Outstanding - Diluted (in shares)	217,169,539	225,611,397	218,214,075	226,325,492
Changes in other-than-temporary-impairment (OTTI) losses	$ (0.2)	$ 0.0	$ (0.2)	$ (0.2)
Other Security Gains (Losses), net	(0.1)	0.0	(0.3)	0.0
Investment Security Gains (Losses), net (Note)	$ (0.3)	$ 0.0	$ (0.5)	$ (0.2)