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Capital Stock Repurchase Plan Transactions (Schedule Of Repurchased Capital Stock) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Capital Stock Repurchase Plan Transactions [Abstract]
Total cost of repurchased shares	$ 163,731	$ 24,975	$ 330,380	$ 147,123
Shares repurchased	350,000	50,000	700,000	325,000
Weighted average price per share	$ 467.80	$ 499.48	$ 471.97	$ 452.69

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

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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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