Shareholders' Equity (Summary of Share Repurchases) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Shareholders' Equity [Abstract]
Total number of shares purchased (in millions)	1.3	0.7
Average price paid per share	$ 332.00	$ 258.33
Total price paid (in millions)	$ 431.6	$ 168.9

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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