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Consolidated Balance Sheets (Parenthetical) - £ / shares
Dec. 31, 2015
Dec. 31, 2014
Preferred stock, par value £ 0.05  
Preferred stock, issued 328,184,640 0
Preferred stock, shares outstanding 328,184,640 0
Preferred stock, equivalent ordinary shares upon future consolidation 32,818,464 0
Common stock, par value £ 0.50 £ 0.50
Common stock, issued 183,577,765 174,610,451
Common stock, outstanding 183,403,263 174,590,372
Treasury stock, shares 174,502 20,079