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Condensed Consolidated Balance Sheets (Parenthetical) - £ / shares
Jun. 30, 2021
Dec. 31, 2020
Statement Of Financial Position [Abstract]    
Common stock, par value £ 0.50 £ 0.50
Common stock, shares authorized, unlimited Unlimited Unlimited
Common stock, issued 402,255,276 398,425,000
Common stock, outstanding 395,222,188 392,538,081
Treasury stock, shares 7,033,088 5,886,919