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Retirement benefits - Benefit Expenses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of defined benefit plans [line items] |  |  |
Current service cost | $ 0.1 | $ 0.4 | $ 1.5
Net interest on net liability | 1.8 | 2.0 | 3.0
Administrative expenses | 0.7 | 0.9 | 1.3
Past service credit | 0.0 | 0.0 | (14.9)
Curtailment credit | 0.0 | (0.6) | (3.3)
Total charge / (credit) for defined benefit plans | 2.6 | 2.7 | (12.4)
Total charge for defined contribution plans | 4.0 | 3.7 | 3.1
Total charge / (credit) for pension plans | 6.6 | 6.4 | (9.3)
U.K. |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Current service cost | 0.0 | 0.3 | 1.4
Net interest on net liability | 1.4 | 1.5 | 2.5
Administrative expenses | 0.2 | 0.4 | 1.0
Past service credit | 0.0 | 0.0 | (14.9)
Curtailment credit | 0.0 | 0.0 | (3.3)
Total charge / (credit) for defined benefit plans | 1.6 | 2.2 | (13.3)
Total charge for defined contribution plans | 1.9 | 1.6 | 1.3
Total charge / (credit) for pension plans | 3.5 | 3.8 | (12.0)
Non-U.K. |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Current service cost | 0.1 | 0.1 | 0.1
Net interest on net liability | 0.4 | 0.5 | 0.5
Administrative expenses | 0.5 | 0.5 | 0.3
Past service credit | 0.0 | 0.0 | 0.0
Curtailment credit | 0.0 | (0.6) | 0.0
Total charge / (credit) for defined benefit plans | 1.0 | 0.5 | 0.9
Total charge for defined contribution plans | 2.1 | 2.1 | 1.8
Total charge / (credit) for pension plans | $ 3.1 | $ 2.6 | $ 2.7

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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 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 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 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 amount of post-employment benefit expense relating to defined benefit plans. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 5 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_5&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 53 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_53&doctype=Standard -URIDate 2017-03-09 + Details
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