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Retirement benefits - Movement in Fair Value of Plan Assets (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) |
Interest on plan assets | (1.8) | (2.0) | $ (3.0)
Exchange difference | (4.6) | 9.6 |
Contributions from employer | 8.9 |  |
Administrative expenses | (0.7) | (0.9) | (1.3)
Net defined benefit liability (asset), ending balance | (55.3) | (66.5) | (58.9)
Fair value of plan assets |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Net defined benefit liability (asset), beginning balance | 316.9 | 336.5 |
Interest on plan assets | 9.0 | 11.5 |
Actuarial gains | 24.2 | 44.9 |
Exchange difference | 27.4 | (49.8) |
Contributions from employer | 8.9 | 7.2 |
Contributions from plan members | 0.0 | 0.1 |
Administrative expenses | (0.7) | (0.9) |
Benefits paid | (18.2) | (18.4) |
Settlement credit | 0.0 | (14.2) |
Net defined benefit liability (asset), ending balance | 367.5 | 316.9 | 336.5
U.K. |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Interest on plan assets | (1.4) | (1.5) | (2.5)
Administrative expenses | (0.2) | (0.4) | (1.0)
U.K. | Fair value of plan assets |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Net defined benefit liability (asset), beginning balance | 280.3 | 287.1 |
Interest on plan assets | 7.5 | 9.4 |
Actuarial gains | 20.4 | 43.7 |
Exchange difference | 27.4 | (49.8) |
Contributions from employer | 7.0 | 6.0 |
Contributions from plan members | 0.0 | 0.1 |
Administrative expenses | (0.2) | (0.4) |
Benefits paid | (16.1) | (15.8) |
Settlement credit | 0.0 | 0.0 |
Net defined benefit liability (asset), ending balance | 326.3 | 280.3 | 287.1
Non-U.K. |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Interest on plan assets | (0.4) | (0.5) | (0.5)
Administrative expenses | (0.5) | (0.5) | (0.3)
Non-U.K. | Fair value of plan assets |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Net defined benefit liability (asset), beginning balance | 36.6 | 49.4 |
Interest on plan assets | 1.5 | 2.1 |
Actuarial gains | 3.8 | 1.2 |
Exchange difference | 0.0 | 0.0 |
Contributions from employer | 1.9 | 1.2 |
Contributions from plan members | 0.0 | 0.0 |
Administrative expenses | (0.5) | (0.5) |
Benefits paid | (2.1) | (2.6) |
Settlement credit | 0.0 | (14.2) |
Net defined benefit liability (asset), ending balance | $ 41.2 | $ 36.6 | $ 49.4

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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 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 Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [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 -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 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 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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- 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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