Shareholders' Equity (Summary of Share Repurchases) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Shareholders' Equity [Abstract]
Total number of shares purchased (in millions)	0.4	1.3	1.1
Average price paid per share	$ 340.70	$ 332.00	$ 291.48
Total price paid (in millions)	$ 150.0	$ 431.6	$ 318.9

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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