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Shareholders' Equity (Summary of Share Repurchases) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Shareholders' Equity [Abstract]
Total number of shares purchased (in millions)	0.7	0.8
Average price paid per share	$ 258.33	$ 242.86
Total price paid (in millions)	$ 168.9	$ 200.0

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Total cost of shares repurchased divided by the total number of shares repurchased.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
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Number of shares that have been repurchased during the period and are being held in treasury.

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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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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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