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Shareholders' Equity - Schedule of Ordinary Share Capital (Details)
$ in Millions
1 Months Ended
Aug. 31, 2018
£ / $
shares
Jun. 30, 2015
£ / $
shares
Mar. 31, 2015
£ / $
shares
Feb. 28, 2015
£ / $
shares
Aug. 31, 2014
£ / $
shares
May 30, 2014
shares
Jan. 31, 2014
£ / $
shares
Mar. 31, 2013
£ / $
shares
Oct. 31, 2012
£ / $
shares
Feb. 28, 2007
£ / $
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
May 31, 2014
£ / $
Class of Stock [Line Items]                          
Common stock, shares authorized                     761,885,318,444 769,463,688,000  
Ordinary shares, value, authorized | $                     $ 185.6 $ 186.6  
Common stock, shares issued                     761,864,338,444 769,440,844,799  
Ordinary shares, value, issued | $                     $ 176.5 $ 176.2  
Foreign currency exchange translation rate | £ / $ 1.2843 1.5715 1.4847 1.5436 1.6580   1.6487 1.5173 1.6129 1.9613     1.6760
Stock Issued During Period, Shares, New Issues 1,863,201 27,679 3,866 8,563 58,399 24,292 12,076 1,924 7,000,000 20,000,000      
Ordinary shares                          
Class of Stock [Line Items]                          
Common stock, shares authorized                     40,000,000 40,000,000  
Ordinary shares, value, authorized | $                     $ 35.7 $ 35.7  
Common stock, shares issued                     29,000,000 27,136,799  
Ordinary shares, value, issued | $                     $ 26.6 $ 25.3  
Deferred shares                          
Class of Stock [Line Items]                          
Common stock, shares authorized                     761,845,318,444 769,423,688,000  
Ordinary shares, value, authorized | $                     $ 149.9 $ 150.9  
Common stock, shares issued                     761,835,338,444 769,413,708,000  
Ordinary shares, value, issued | $                     $ 149.9 $ 150.9