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Condensed Consolidated Balance Sheets (Parenthetical) - £ / shares
Mar. 31, 2016
Dec. 31, 2015
Preferred stock, par value £ 0.05 £ 0.05
Preferred stock, issued 328,184,640 328,184,640
Preferred stock, shares outstanding 328,184,640 328,184,640
Preferred stock, equivalent ordinary shares upon future consolidation outstanding 32,818,464 32,818,464
Common stock, par value £ 0.50 £ 0.50
Common stock, issued 185,121,923 183,577,765
Common stock, outstanding 184,441,180 183,403,263
Treasury stock, shares 680,743 174,502