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Consolidated Balance Sheets (Parenthetical)
Dec. 31, 2019
£ / shares
shares
Dec. 31, 2019
$ / shares
shares
Dec. 31, 2018
£ / shares
shares
Dec. 31, 2018
$ / shares
shares
Treasury shares, shares held 7,900,000 7,900,000 5,900,000 5,900,000
Class A Ordinary Shares, U.S. [Member]        
Common shares, par value | $ / shares   $ 0.40   $ 0.40
Common shares, shares issued 205,900,000 205,900,000 115,200,000 115,200,000
Common Class B, Par Value In GBP [Member]        
Common shares, par value | £ / shares £ 1   £ 1  
Common shares, shares issued 50,000 50,000 50,000 50,000