Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	PREFERRED STOCK	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	RETAINED EARNINGS	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	TREASURY STOCK
Balance, beginning of period at Dec. 31, 2020	$ 11,688.3	$ 884.9	$ 408.6	$ 963.6	$ 12,207.7	$ 428.0	$ (3,204.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	1,545.3				1,545.3
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	(463.6)					(463.6)
Dividends Declared:
Common Stock	(593.9)				(593.9)
Preferred Stock	(41.8)				(41.8)
Stock Awards and Options Exercised	150.1			(24.3)			174.4
Stock Purchased	(267.6)						(267.6)
Balance, end of period at Dec. 31, 2021	12,016.8	884.9	408.6	939.3	13,117.3	(35.6)	(3,297.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	1,336.0				1,336.0
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	(1,533.6)					(1,533.6)
Dividends Declared:
Common Stock	(613.0)				(613.0)
Preferred Stock	(41.8)				(41.8)		0.0
Stock Awards and Options Exercised	130.5			44.2			86.3
Stock Purchased	(35.4)						(35.4)
Balance, end of period at Dec. 31, 2022	11,259.5	884.9	408.6	983.5	13,798.5	(1,569.2)	(3,246.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	1,107.3				1,107.3
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	431.3					431.3
Dividends Declared:
Common Stock	(630.2)				(630.2)
Preferred Stock	(41.8)				(41.8)
Stock Awards and Options Exercised	121.8			26.1			95.7
Stock Purchased	(347.5)						(347.5)
Excise Tax on Share Repurchases	(2.5)						(2.5)
Balance, end of period at Dec. 31, 2023	$ 11,897.9	$ 884.9	$ 408.6	$ 1,009.6	$ 14,233.8	$ (1,137.9)	$ (3,501.1)