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Condensed Consolidated Balance Sheets (Parenthetical)
Sep. 30, 2016
£ / shares
shares
Sep. 30, 2016
$ / shares
shares
Dec. 31, 2015
£ / shares
shares
Dec. 31, 2015
$ / shares
shares
Treasury shares, shares held (in shares) 7,200,000 7,200,000 7,600,000 7,600,000
Class A ordinary shares, U.S. [Member]        
Common stock, par value per share (in dollars per share or pounds sterling per share) | $ / shares   $ 0.10   $ 0.1
Common shares, shares authorized (in shares) 450,000,000.0 450,000,000.0 450,000,000 450,000,000
Common shares, shares issued (in shares) 308,500,000 308,500,000 242,900,000 242,900,000
Common Class B, Par Value In GBP [Member]        
Common stock, par value per share (in dollars per share or pounds sterling per share) | £ / shares £ 1   £ 1  
Common shares, shares authorized (in shares) 50,000 50,000 50,000 50,000
Common shares, shares issued (in shares) 50,000 50,000 50,000 50,000