Shareholders' Equity (Summary of Share Repurchases) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	2 Months Ended	12 Months Ended
	Mar. 01, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Total number of shares purchased (in millions)		1.9	3.1	2.0
Average price paid per share		$ 309.79	$ 280.17	$ 231.87
Total price paid (in millions)		$ 582.5	$ 856.0	$ 470.3
Subsequent Event [Member]
Total number of shares purchased (in millions)	1.0
Average price paid per share	$ 334.40
Total price paid (in millions)	$ 350.0