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Retirement benefits - Movement in Pension Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Employee Benefits [Abstract]
Net defined benefit liability (asset), beginning balance	$ 66.5	$ 58.9
(Credited) / charged to the consolidated income statement:
Past service credit	0.0	0.0	$ (14.9)
Curtailment credit	0.0	(0.6)	(3.3)
Current service cost	0.1	0.4	1.5
Net interest on net liability	1.8	2.0	3.0
Administrative costs	0.7	0.9	1.3
Total charge for defined contribution plans	4.0	3.7	3.1
Cash contributions	(12.9)	(10.9)
(Credited) / charged to the consolidated statement of comprehensive income	(9.5)	21.7
Exchange difference	4.6	(9.6)
Net defined benefit liability (asset), ending balance	$ 55.3	$ 66.5	$ 58.9

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- References

No definition available.

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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

+ References

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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)]

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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)]

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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)]

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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]]

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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)]

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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]]

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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.

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Administrative Costs, Net Defined Benefit Liability (Asset)

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Curtailment Cost, Net Defined Benefit Liability (Asset)

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Employee Benefits [Abstract]

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