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Retirement benefits - Narrative (Details) £ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2005 GBP (£) | Dec. 31, 2017 USD ($) year Member | Dec. 31, 2017 GBP (£) year Member | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 GBP (£)
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Total charge (credit) for retirement plans |  | $ (6,600,000) |  | $ (6,400,000) | $ 9,300,000 |
Remeasurement of defined benefit retirement plans |  | 9,500,000 |  | (21,700,000) | 4,400,000 |
Curtailment credit arising from changes to defined benefit pension plans |  | 0 |  | 600,000 | 3,300,000 |
Past service credit |  | 0 |  | 0 | 14,900,000 |
Changes to defined benefit pension plans |  | 0 |  | 600,000 | 18,000,000 |
Remeasurement of defined benefit retirement plans |  | (9,500,000) |  | 21,700,000 |  |
Return on plan assets, gain (loss) |  | 33,200,000 |  | 56,400,000 | (600,000) |
Defined benefit obligation |  | 422,800,000 |  | 383,400,000 |  |
Estimate of contributions expected to be paid to plan for next annual reporting period |  | 8,700,000 |  |  |  |
Actual employer contributions |  | 8,900,000 |  |  |  |
Unfunded Plan |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Defined benefit obligation |  | 2,100,000 |  | 2,600,000 |  |
Funded Plan |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Defined benefit obligation |  | $ 420,700,000 |  | 380,800,000 |  |
U.K. |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Salary earnings cap on defined benefit plans | £ | £ 60 |  |  |  |  | £ 76
Number of active members in employee benefit plan | Member |  | 160 | 160 |  |  |
Weighted average duration of defined benefit obligation | year |  | 18 | 18 |  |  |
Minimum annual contribution | £ |  |  | £ 3,800 |  |  |
Expected percent of earnings rate one |  | 15.00% | 15.00% |  |  |
Expected percent of earnings rate two |  | 10.00% | 10.00% |  |  |
Expected earnings amount two | £ |  |  | £ 24,000 |  |  |
Total charge (credit) for retirement plans |  | $ (3,500,000) |  | (3,800,000) | 12,000,000 |
Curtailment credit arising from changes to defined benefit pension plans |  | 0 |  | 0 | 3,300,000 |
Past service credit |  | 0 |  | 0 | 14,900,000 |
Defined benefit obligation |  | 369,700,000 |  | 334,800,000 |  |
U.K. | Minimum |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Expected earnings amount one | £ |  |  | 12,000 |  |  |
U.K. | Maximum |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Expected earnings amount one | £ |  |  | £ 24,000 |  |  |
Non-U.K. |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Total charge (credit) for retirement plans |  | (3,100,000) |  | (2,600,000) | (2,700,000) |
Annuity settlement payments |  |  |  | 10,000,000 |  |
Credit (charge) from annuity settlement payments |  |  |  | (100,000) |  |
Lump sum settlement payments |  |  |  | 4,200,000 |  |
Credit (charge) from cash settlement payment |  |  |  | 700,000 |  |
Curtailment credit arising from changes to defined benefit pension plans |  | 0 |  | 600,000 | 0 |
Past service credit |  | 0 |  | 0 | 0 |
Defined benefit obligation |  | 53,100,000 |  | 48,600,000 |  |
Cost of sales |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Total charge (credit) for retirement plans |  | (4,100,000) |  | (4,100,000) | 4,600,000 |
Administrative costs |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Total charge (credit) for retirement plans |  | (700,000) |  | (900,000) | 1,300,000 |
Changes to defined benefit pension plans |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Total charge (credit) for retirement plans |  | 0 |  | 600,000 | 18,000,000 |
Finance costs |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Total charge (credit) for retirement plans |  | $ (1,800,000) |  | (2,000,000) | $ (3,000,000) |
$10 million liabilities settlement of U.S, Plan | Non-U.K. |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Gross amounts settled |  |  |  | 14,800,000 |  |
Settlement lump sums paid | Non-U.K. |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Gross amounts settled |  |  |  | $ 14,200,000 |  |

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- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_f&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 147 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_147_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_148_d_iii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of other comprehensive income, net of tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income; Defined benefit plans [member]; Plan assets [member]; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_91_a&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan). [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_d&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan in respect of settlements. [Refer: Gains (losses) arising from settlements, net defined benefit liability (asset); Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_g&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets. The return on plans assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c_i&doctype=Standard -URIDate 2017-03-09 + Details
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