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Share capital - Own shares held by ESOP (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2017 £ / shares shares | Dec. 31, 2016 £ / shares shares | Dec. 31, 2015 £ / shares
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Beginning balance | $ 141.9 | $ 169.7 | $ 175.4 |  |  |
Purchase of shares from ESOP |  | (1.0) | 0.1 |  |  |
Exchange movement on ESOP |  |  | 0.1 |  |  |
Ending balance | 162.3 | 141.9 | 169.7 |  |  |
Number of treasury shares held | shares |  |  |  | 527,616 | 665,424 |
Par value per share (in GBP per share) | £ / shares |  |  |  | £ 0.50 | £ 0.5 | £ 0.5
Ordinary shares |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Par value per share (in GBP per share) | £ / shares |  |  |  | £ 0.50 | £ 0.50 |
Own shares held by ESOP |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Beginning balance | (0.5) | (0.2) | (0.4) |  |  |
Purchase of shares from ESOP | (0.8) | (1.0) | 0.1 |  |  |
Exchange movement on ESOP |  | 0.7 | 0.1 |  |  |
Utilization of shares from ESOP | 0.3 | 0.7 |  |  |  |
Ending balance | $ (1.0) | $ (0.5) | $ (0.2) |  |  |
Own shares held by ESOP | Ordinary shares |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Number of treasury shares held | shares |  |  |  | 104,709 | 55,816 |

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