Share-Based Compensation (Summary Of Stock-Option Activity) (Details) (USD $)	12 Months Ended
Dec. 31, 2011
Share-Based Compensation [Abstract]
Number of Options, Outstanding at December 31, 2010	2,585,385
Number of Options, Granted	629,789
Number of Options, Exercised	(244,944)
Number of Options, Expired or cancelled	(319,367)
Number of Options, Outstanding at December 31, 2011	2,650,863
Number of Options, Exercisable at December 31, 2011	1,792,691
Weighted-Average Exercise Price, Outstanding at December 31, 2010	$ 36.41
Weighted-Average Exercise Price, Granted	$ 32.37
Weighted- Average Exercise Price, Exercised	$ 22.59
Weighted- Average Exercise Price, Expired or cancelled	$ 45.85
Weighted- Average Exercise Price, Outstanding at December 31, 2011	$ 35.59
Weighted- Average Exercise Price, Exercisable at December 31, 2011	$ 38.76

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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The combined weighted average exercise price associated with stock options during the period that have either lapsed or been forfeited.

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Net number of share options (or share units) granted during the period.

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The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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Number of share options (or share units) exercised during the current period.

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