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Condensed Consolidated Balance Sheets (Parenthetical) - £ / shares	Sep. 30, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Preferred stock, par value	£ 0.05	£ 0.05
Preferred stock, shares authorized, unlimited	Unlimited	Unlimited
Preferred stock, issued	289,317,460	328,184,640
Preferred stock, shares outstanding	289,317,460	328,184,640
Preferred stock, equivalent ordinary shares upon future consolidation outstanding	28,931,746	32,818,464
Common stock, par value	£ 0.50	£ 0.50
Common stock, shares authorized, unlimited	Unlimited	Unlimited
Common stock, issued	307,309,316	272,719,044
Common stock, outstanding	304,089,718	271,022,011
Treasury stock, shares	3,219,598	1,697,033

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Face amount or stated value per share of common stock.

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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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