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Shareholders' Equity (Summary of Share Repurchases) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	Nov. 07, 2023	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2022
Total number of shares purchased (in millions)		0.4	0.4	1.3
Average price per share		$ 197.75	$ 197.75	$ 332.00
Total purchase price (in millions)		$ 87.3	$ 87.3	$ 431.6
Subsequent Event [Member]
Total number of shares purchased (in millions)	0.1
Average price per share	$ 198.84
Total purchase price (in millions)	$ 12.7

X

- Definition

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

+ References

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-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-Publisher FASB
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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

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-Section 50
-Paragraph 2
-SubTopic 10
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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.

+ References

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