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Share Repurchase Program (Schedule Of Shares Repurchased) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Proceeds from (Repurchase of) Equity [Abstract]
Shares repurchased	1,575	3,475	3,763	5,304
Average price per share	$ 264.38	$ 245.26	$ 256.64	$ 253.13
Total investment	$ 416,402	$ 852,226	$ 965,830	$ 1,342,538

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Number of shares that have been repurchased and retired during the period.

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

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

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