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Condensed Consolidated Balance Sheets (Parenthetical) (GBP £)	Mar. 31, 2015	Dec. 31, 2014
Common stock, par	£ 0.50us-gaap_CommonStockParOrStatedValuePerShare	£ 0.50us-gaap_CommonStockParOrStatedValuePerShare
Common stock, issued	177,096,650us-gaap_CommonStockSharesIssued	174,610,451us-gaap_CommonStockSharesIssued
Common stock, outstanding	176,962,313us-gaap_CommonStockSharesOutstanding	174,590,372us-gaap_CommonStockSharesOutstanding
Preferred stock, par value	£ 0.05us-gaap_PreferredStockParOrStatedValuePerShare	£ 0.05us-gaap_PreferredStockParOrStatedValuePerShare
Preferred shares, issued	352,150,790us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding	352,150,790us-gaap_PreferredStockSharesOutstanding	0us-gaap_PreferredStockSharesOutstanding
Treasury stock, shares	134,337us-gaap_TreasuryStockShares	20,079us-gaap_TreasuryStockShares

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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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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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