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Condensed Consolidated Balance Sheets (Parenthetical) (GBP £)	Jun. 30, 2013	Dec. 31, 2012
Common stock, par value	£ 0.50	£ 0.50
Common stock, issued	150,752,960	150,360,933
Common stock, outstanding	150,732,881	150,340,854
Treasury stock, shares	20,079	20,079

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Face amount or stated value per share of common stock.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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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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