Net Interest Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Interest Income
Federal Reserve and Other Central Bank Deposits	$ 1,735.9	$ 1,462.3	$ 472.0
Interest-Bearing Due from and Deposits with Banks	122.6	130.1	46.6
Federal Funds Sold	0.0	0.3	0.1
Securities Purchased under Agreements to Resell	3,340.2	1,585.2	103.7
Securities – Taxable	1,888.6	1,534.4	899.9
Securities - Non-Taxable	1.1	1.3	1.3
Loans and Leases	2,567.1	2,551.1	1,344.3
Other Interest-Earning Assets	106.8	60.3	9.8
Total Interest Income	9,762.3	7,325.0	2,877.7
Interest Expense
Deposits	3,415.9	2,685.3	602.8
Federal Funds Purchased	129.2	256.9	34.1
Securities Sold under Agreements to Repurchase	3,280.4	1,541.1	90.7
Other Borrowings	362.7	542.5	126.2
Senior Notes	173.5	170.0	92.7
Long-Term Debt	223.5	147.2	44.0
Total Interest Expense	7,585.2	5,343.0	990.5
Net Interest Income	$ 2,177.1	$ 1,982.0	$ 1,887.2