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Retirement benefits - Movement in Defined Benefit Obligations (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Net defined benefit liability (asset), beginning balance | $ 66.5 | $ 58.9 |
Service cost | 0.1 | 0.4 | $ 1.5
Interest on obligation | 1.8 | 2.0 | 3.0
Exchange difference | 4.6 | (9.6) |
Past service credit | 0.0 | 0.0 | (14.9)
Curtailment credit | 0.0 | (0.6) | (3.3)
Net defined benefit liability (asset), ending balance | 55.3 | 66.5 | 58.9
Present value of defined benefit obligation |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Net defined benefit liability (asset), beginning balance | 383.4 | 395.4 |
Service cost | 0.1 | 0.4 |
Interest on obligation | 10.8 | 13.5 |
Contributions from plan members | 0.0 | 0.1 |
Actuarial gains on financial assumptions | 10.7 | 70.1 |
Actuarial gains on plan experience | 4.0 | (3.5) |
Exchange difference | 32.0 | (59.4) |
Benefits paid | (18.2) | (18.4) |
Curtailment credit | 0.0 | (14.8) |
Net defined benefit liability (asset), ending balance | 422.8 | 383.4 | 395.4
U.K. |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Service cost | 0.0 | 0.3 | 1.4
Interest on obligation | 1.4 | 1.5 | 2.5
Actuarial gains on financial assumptions |  |  | 14.9
Past service credit | 0.0 | 0.0 | (14.9)
Curtailment credit | 0.0 | 0.0 | (3.3)
U.K. | Present value of defined benefit obligation |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Net defined benefit liability (asset), beginning balance | 334.8 | 334.4 |
Service cost | 0.0 | 0.3 |
Interest on obligation | 8.9 | 10.9 |
Contributions from plan members | 0.0 | 0.1 |
Actuarial gains on financial assumptions | 6.9 | 67.5 |
Actuarial gains on plan experience | 3.5 | (3.3) |
Exchange difference | 31.7 | (59.3) |
Benefits paid | (16.1) | (15.8) |
Curtailment credit | 0.0 | 0.0 |
Net defined benefit liability (asset), ending balance | 369.7 | 334.8 | 334.4
Non-U.K. |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Service cost | 0.1 | 0.1 | 0.1
Interest on obligation | 0.4 | 0.5 | 0.5
Past service credit | 0.0 | 0.0 | 0.0
Curtailment credit | 0.0 | (0.6) | 0.0
Non-U.K. | Present value of defined benefit obligation |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Net defined benefit liability (asset), beginning balance | 48.6 | 61.0 |
Service cost | 0.1 | 0.1 |
Interest on obligation | 1.9 | 2.6 |
Contributions from plan members | 0.0 | 0.0 |
Actuarial gains on financial assumptions | 3.8 | 2.6 |
Actuarial gains on plan experience | 0.5 | (0.2) |
Exchange difference | 0.3 | (0.1) |
Benefits paid | (2.1) | (2.6) |
Curtailment credit | 0.0 | (14.8) |
Net defined benefit liability (asset), ending balance | $ 53.1 | $ 48.6 | $ 61.0

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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph c -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c_iii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments that result in remeasurements of the net defined benefit liability (asset). Experience adjustments deal with the effects of differences between the previous actuarial assumptions and what has actually occurred. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [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 increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_e&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_140_a&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. [Refer: Net defined benefit liability (asset)] + 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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