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Consolidated Balance Sheets (Parenthetical) - £ / shares
12 Months Ended
Dec. 31, 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 404,084,775 398,425,000
Common stock, outstanding 396,598,008 392,538,081
Treasury stock, shares 7,486,767 5,886,919