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Consolidated Balance Sheets (Parenthetical) (GBP £)	Dec. 31, 2014	Dec. 31, 2013
Common stock, par value	£ 0.50us-gaap_CommonStockParOrStatedValuePerShare	£ 0.50us-gaap_CommonStockParOrStatedValuePerShare
Common stock, issued	174,610,451us-gaap_CommonStockSharesIssued	172,691,063us-gaap_CommonStockSharesIssued
Common stock, outstanding	174,590,372us-gaap_CommonStockSharesOutstanding	172,670,984us-gaap_CommonStockSharesOutstanding
Treasury stock, shares	20,079us-gaap_TreasuryStockShares	20,079us-gaap_TreasuryStockShares

X

- Definition

Face amount or stated value per share of common stock.

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X

- Definition

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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X

- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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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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