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Share capital - Ordinary share capital (Details) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
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, 2017 USD ($) £ / $ shares | Dec. 31, 2017 £ / shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2016 £ / shares | Dec. 31, 2015 £ / shares | May 31, 2014 $ / £
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  |  |  |  |  | 769,463,688,000 |  | 769,463,688,000 |  |  |
Number of shares alloted, called up and fully paid |  |  |  |  |  |  |  |  |  | 769,440,844,799 |  | 769,440,844,799 |  |  |
Shares authorized, value | $ |  |  |  |  |  |  |  |  |  | $ 186.6 |  | $ 186.6 |  |  |
Shares alloted, called up and fully paid, value | $ |  |  |  |  |  |  |  |  |  | $ 176.2 |  | $ 176.2 |  |  |
Closing foreign exchange rate | 1.5715 | 1.4847 | 1.5436 | 1.6580 |  | 1.6487 | 1.5173 | 1.6129 | 1.9613 | 0.7401 |  |  |  |  | 1.6760
Number of shares issued | 27,679 | 3,866 | 8,563 | 58,399 | 24,292 | 12,076 | 1,924 | 7,000,000 | 20,000,000 |  |  |  |  |  |
Par value per share (in GBP per share) | £ / shares |  |  |  |  |  |  |  |  |  |  | £ 0.50 |  | £ 0.5 | £ 0.5 |
Number of shares outstanding |  |  |  |  |  |  |  |  |  | 25,929,312 |  |  |  |  |
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  |  |  |  |  | 40,000,000 |  | 40,000,000 |  |  |
Number of shares alloted, called up and fully paid |  |  |  |  |  |  |  |  |  | 27,136,799 |  | 27,136,799 |  |  |
Shares authorized, value | $ |  |  |  |  |  |  |  |  |  | $ 35.7 |  | $ 35.7 |  |  |
Shares alloted, called up and fully paid, value | $ |  |  |  |  |  |  |  |  |  | $ 25.3 |  | $ 25.3 |  |  |
Par value per share (in GBP per share) | £ / shares |  |  |  |  |  |  |  |  |  |  | 0.50 |  | £ 0.50 |  |
Deferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  |  |  |  |  | 769,423,688,000 |  | 769,423,688,000 |  |  |
Number of shares alloted, called up and fully paid |  |  |  |  |  |  |  |  |  | 769,413,708,000 |  | 769,413,708,000 |  |  |
Shares authorized, value | $ |  |  |  |  |  |  |  |  |  | $ 150.9 |  | $ 150.9 |  |  |
Shares alloted, called up and fully paid, value | $ |  |  |  |  |  |  |  |  |  | $ 150.9 |  | $ 150.9 |  |  |
Par value per share (in GBP per share) | £ / shares |  |  |  |  |  |  |  |  |  |  | £ 0.0001 |  |  |  |
Multiple of amount paid up on ordinary shares |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |

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