Offsetting of Assets and Liabilities (Offsetting of Derivative Liabilities and Securities Sold Under Agreements to Repurchase) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Total Derivatives Subject to a Master Netting Arrangement
GROSS RECOGNIZED LIABILITIES	$ 2,548.9	$ 1,566.5
GROSS AMOUNTS OFFSET IN THE BALANCE SHEET	1,865.9	1,283.5
NET AMOUNTS PRESENTED IN THE BALANCE SHEET	683.0	283.0
Gross amounts not offset in the balance sheet	0.0	0.0
Net Amount	683.0	283.0
Total Derivatives Not Subject to a Master Netting Arrangement
GROSS RECOGNIZED LIABILITIES	1,105.2	568.7
NET AMOUNT	1,105.2	568.7
Total Derivatives
GROSS RECOGNIZED LIABILITIES	3,654.1	2,135.2
Derivative Liabilities	1,788.2	851.7
GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET	0.0	0.0
Net Amount	1,788.2	851.7
Securities Sold under Agreements to Repurchase [Abstract]
GROSS RECOGNIZED LIABILITIES	11,991.1	1,924.4
Gross amounts offset in the balance sheet	11,423.9	1,392.5
Securities Sold Under Agreements to Repurchase	567.2	531.9
GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET	567.2	531.9
Other liabilities	3,200.0	3,300.0
Foreign Exchange Contracts | Over the Counter Derivative
Total Derivatives Subject to a Master Netting Arrangement
GROSS RECOGNIZED LIABILITIES	2,082.3	1,430.1
GROSS AMOUNTS OFFSET IN THE BALANCE SHEET	1,826.7	1,234.5
NET AMOUNTS PRESENTED IN THE BALANCE SHEET	255.6	195.6
Gross amounts not offset in the balance sheet	0.0	0.0
Net Amount	255.6	195.6
Interest Rate Swaps | Over the Counter Derivative
Total Derivatives Subject to a Master Netting Arrangement
GROSS RECOGNIZED LIABILITIES	426.5	98.7
GROSS AMOUNTS OFFSET IN THE BALANCE SHEET	5.9	48.1
NET AMOUNTS PRESENTED IN THE BALANCE SHEET	420.6	50.6
Net Amount	420.6	50.6
Interest Rate Swaps | Interest Rate Swaps Exchange Cleared
Total Derivatives Subject to a Master Netting Arrangement
GROSS RECOGNIZED LIABILITIES	5.3	0.2
GROSS AMOUNTS OFFSET IN THE BALANCE SHEET	0.0	0.0
NET AMOUNTS PRESENTED IN THE BALANCE SHEET	5.3	0.2
Net Amount	5.3	0.2
Other Financial Derivatives | Other Financial Derivatives
Total Derivatives Subject to a Master Netting Arrangement
GROSS RECOGNIZED LIABILITIES	34.8	37.5
GROSS AMOUNTS OFFSET IN THE BALANCE SHEET	33.3	0.9
NET AMOUNTS PRESENTED IN THE BALANCE SHEET	1.5	36.6
Net Amount	$ 1.5	$ 36.6