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Retirement benefits - Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of fair value of plan assets [line items] |  |
Equities and growth funds | $ 226.3 | $ 192.2
Government bonds | 49.9 | 44.3
Corporate bonds | 91.0 | 80.5
Cash | 0.3 | (0.1)
Total market value of assets | 367.5 | 316.9
Present value of plan liabilities | (422.8) | (383.4)
Deficit in the plans | (55.3) | (66.5)
Related deferred income tax assets | 10.9 | 14.6
Net pension liabilities | (44.4) | (51.9)
U.K. |  |
Disclosure of fair value of plan assets [line items] |  |
Equities and growth funds | 203.4 | 171.6
Government bonds | 49.9 | 44.3
Corporate bonds | 72.7 | 64.5
Cash | 0.3 | (0.1)
Total market value of assets | 326.3 | 280.3
Present value of plan liabilities | (369.7) | (334.8)
Deficit in the plans | (43.4) | (54.5)
Related deferred income tax assets | 7.8 | 10.2
Net pension liabilities | (35.6) | (44.3)
Non-U.K. |  |
Disclosure of fair value of plan assets [line items] |  |
Equities and growth funds | 22.9 | 20.6
Government bonds | 0.0 | 0.0
Corporate bonds | 18.3 | 16.0
Cash | 0.0 | 0.0
Total market value of assets | 41.2 | 36.6
Present value of plan liabilities | (53.1) | (48.6)
Deficit in the plans | (11.9) | (12.0)
Related deferred income tax assets | 3.1 | 4.4
Net pension liabilities | $ (8.8) | $ (7.6)

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- Definition The amount that cash and cash equivalents constitute of the fair value of defined benefit plan assets. [Refer: Cash and cash equivalents; Plan assets, at fair value; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 142 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_142_a&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 amount that instruments representing equity (rather than debt) constitute of the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 142 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_142_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + 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 amount of deficit in a defined benefit plan. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The present value of the defined benefit obligation, less the fair value of the plan assets (if any). [Refer: Plan assets [member]] + 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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