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Income taxes - Factors that may affect future taxation charge (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 01, 2020 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Unused tax losses for which no deferred tax asset recognised |  | $ 81.9 | $ 72.1 | $ 82.9
Standard corporate tax rate |  | 19.25% | 20.00% | 20.25%
Certain trading and capital losses and other temporary timing difference |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Unused tax losses for which no deferred tax asset recognised |  | $ 13.3 | $ 12.3 | $ 14.2
U.K. |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Unused tax losses for which no deferred tax asset recognised |  | 43.6 | 35.3 | 52.9
Non-U.K. |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Unused tax losses for which no deferred tax asset recognised |  | $ 38.3 | $ 36.8 | $ 30.0
Changes in tax rates or tax laws enacted or announced |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Standard corporate tax rate | 17.00% |  |  |

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_e&doctype=Standard -URIDate 2017-03-09 + Details
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