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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 |

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