Shareholders Equity (Details) (USD $)	9 Months Ended
Sep. 30, 2011	Nov. 01, 2011	Dec. 31, 2010	Feb. 09, 2009
Shareholders Equity (Textual) [Abstract]
Par value of ordinary Common shares	$ 0.01		$ 0.01
Number of common shares outstanding	158,101,261		164,130,802
Number of shares held in treasury	14,325,562		6,537,900
Common shares issued for employee incentive, benefit plans and dividend reinvestment program	1,758,121
Treasury shares purchased	7,787,662
Treasury shares purchased, average cost per share	$ 49.18
Number of Common Stock Authorized for Purchase		10,000,000		10,000,000
Number of shares expected to be repurchased to offset dilution from share issuances under equity compensation plans	3,000,000
Number of shares authorized for repurchase	3,941,073

Number of shares expected to be repurchased to offset dilution from share issuances under equity compensation plans.

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Shareholders equity.

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Face amount or stated value of common stock per share; generally not indicative of the fair market value per share.

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-Publisher SEC

-Name Regulation S-X (SX)

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Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any.

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The number of shares newly issued during the reporting period under the plan.

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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

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