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Retirement benefits (Tables) | 12 Months Ended
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Dec. 31, 2017
Employee Benefits [Abstract] |
Disclosure of movement in pension plan | The movement in the pension liabilities is shown below:
|  | 2017 |  | 2016 |
|  | $M |  | $M |
| Balance at January 1 | 66.5 |  |  | 58.9 |  |
| (Credited) / charged to the consolidated income statement: |  |  |  |
| Past service credit | — |  |  | — |  |
| Curtailment credit | — |  |  | (0.6 | ) |
| Current service cost | 0.1 |  |  | 0.4 |  |
| Net interest on net liability | 1.8 |  |  | 2.0 |  |
| Administrative costs | 0.7 |  |  | 0.9 |  |
| Total charge for defined contribution plans | 4.0 |  |  | 3.7 |  |
| 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 | ) |
| Balance at December 31 | 55.3 |  |  | 66.5 |  |
Analysis of movement in the present value of the fair value of plan assets:
|  | 2017 |  | 2017 |  | 2017 |  | 2016 |  | 2016 |  | 2016 |
|  | U.K. |  | Non-U.K. |  | Total |  | U.K. |  | Non-U.K. |  | Total |
|  | $M |  | $M |  | $M |  | $M |  | $M |  | $M |
| At January 1 | 280.3 |  |  | 36.6 |  |  | 316.9 |  |  | 287.1 |  |  | 49.4 |  |  | 336.5 |  |
| Interest on plan assets | 7.5 |  |  | 1.5 |  |  | 9.0 |  |  | 9.4 |  |  | 2.1 |  |  | 11.5 |  |
| Actuarial gains | 20.4 |  |  | 3.8 |  |  | 24.2 |  |  | 43.7 |  |  | 1.2 |  |  | 44.9 |  |
| Exchange difference | 27.4 |  |  | — |  |  | 27.4 |  |  | (49.8 | ) |  | — |  |  | (49.8 | ) |
| Contributions from employer | 7.0 |  |  | 1.9 |  |  | 8.9 |  |  | 6.0 |  |  | 1.2 |  |  | 7.2 |  |
| Contributions from plan members | — |  |  | — |  |  | — |  |  | 0.1 |  |  | — |  |  | 0.1 |  |
| Administrative expenses | (0.2 | ) |  | (0.5 | ) |  | (0.7 | ) |  | (0.4 | ) |  | (0.5 | ) |  | (0.9 | ) |
| Benefits paid | (16.1 | ) |  | (2.1 | ) |  | (18.2 | ) |  | (15.8 | ) |  | (2.6 | ) |  | (18.4 | ) |
| Settlement credit | — |  |  | — |  |  | — |  |  | — |  |  | (14.2 | ) |  | (14.2 | ) |
| At December 31 | 326.3 |  |  | 41.2 |  |  | 367.5 |  |  | 280.3 |  |  | 36.6 |  |  | 316.9 |  |
Analysis of movement in the present value of the defined benefit obligations:
|  | 2017 |  | 2017 |  | 2017 |  | 2016 |  | 2016 |  | 2016 |
|  | U.K. |  | Non-U.K. |  | Total |  | U.K. |  | Non-U.K. |  | Total |
|  | $M |  | $M |  | $M |  | $M |  | $M |  | $M |
| At January 1 | 334.8 |  |  | 48.6 |  |  | 383.4 |  |  | 334.4 |  |  | 61.0 |  |  | 395.4 |  |
| Service cost | — |  |  | 0.1 |  |  | 0.1 |  |  | 0.3 |  |  | 0.1 |  |  | 0.4 |  |
| Interest on obligation | 8.9 |  |  | 1.9 |  |  | 10.8 |  |  | 10.9 |  |  | 2.6 |  |  | 13.5 |  |
| Contributions from plan members | — |  |  | — |  |  | — |  |  | 0.1 |  |  | — |  |  | 0.1 |  |
| Actuarial gains on financial assumptions | 6.9 |  |  | 3.8 |  |  | 10.7 |  |  | 67.5 |  |  | 2.6 |  |  | 70.1 |  |
| Actuarial gains on plan experience | 3.5 |  |  | 0.5 |  |  | 4.0 |  |  | (3.3 | ) |  | (0.2 | ) |  | (3.5 | ) |
| Exchange difference | 31.7 |  |  | 0.3 |  |  | 32.0 |  |  | (59.3 | ) |  | (0.1 | ) |  | (59.4 | ) |
| Benefits paid | (16.1 | ) |  | (2.1 | ) |  | (18.2 | ) |  | (15.8 | ) |  | (2.6 | ) |  | (18.4 | ) |
| Curtailment credit | — |  |  | — |  |  | — |  |  | — |  |  | (14.8 | ) |  | (14.8 | ) |
| At December 31 | 369.7 |  |  | 53.1 |  |  | 422.8 |  |  | 334.8 |  |  | 48.6 |  |  | 383.4 |  |
Disclosure of defined benefit plan assumptions | The financial assumptions used in the calculations were:
|  | Projected Unit Credit Valuation |
|  | U.K. |  | Non-U.K. |
|  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015 |
|  | % |  | % |  | % |  | % |  | % |  | % |
| Discount rate | 2.40 |  | 2.60 |  | 3.70 |  | 3.60 |  | 4.20 |  | 4.50 |
| Retail Price Inflation | 3.10 |  | 3.20 |  | 3.00 |  | — |  | — |  | — |
| Inflation related assumptions: |  |  |  |  |  |  |  |  |  |  |  |
| Salary inflation | n/a |  | n/a |  | 4.00 |  | — |  | — |  | — |
| Consumer Price Inflation | 2.10 |  | 2.20 |  | 2.00 |  | — |  | — |  | — |
| Pension increases—pre 6 April 1997 | 1.90 |  | 2.00 |  | 1.80 |  | — |  | — |  | — |
| —1997 - 2005 | 2.10 |  | 2.20 |  | 2.10 |  | — |  | — |  | — |
| —post 5 April 2005 | 1.70 |  | 1.80 |  | 1.70 |  | — |  | — |  | — |
|  | 2017 |  | 2016 |
| Other principal actuarial assumptions: | Years |  | Years |
| Life expectancy of male / female in the U.K. aged 65 at accounting date | 21.6 / 24.6 |  | 21.5 / 24.5 |
| Life expectancy of male / female in the U.K. aged 65 at 20 years after accounting date | 23.3 / 26.5 |  | 23.2 / 26.4 |
Disclosure of pension plan expenses | The amounts recognized in the consolidated income statement in respect of the pension plans were as follows:
|  | 2017 |  | 2017 |  | 2017 |  | 2016 |  | 2016 |  | 2016 |  | 2015 |  | 2015 |  | 2015 |
|  | U.K. |  | Non-U.K. |  | Total |  | U.K. |  | Non-U.K. |  | Total |  | U.K. |  | Non-U.K. |  | Total |
|  | $M |  | $M |  | $M |  | $M |  | $M |  | $M |  | $M |  | $M |  | $M |
| In respect of defined benefit plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Current service cost | — |  |  | 0.1 |  |  | 0.1 |  |  | 0.3 |  |  | 0.1 |  |  | 0.4 |  |  | 1.4 |  |  | 0.1 |  |  | 1.5 |  |
| Net interest on net liability | 1.4 |  |  | 0.4 |  |  | 1.8 |  |  | 1.5 |  |  | 0.5 |  |  | 2.0 |  |  | 2.5 |  |  | 0.5 |  |  | 3.0 |  |
| Administrative expenses | 0.2 |  |  | 0.5 |  |  | 0.7 |  |  | 0.4 |  |  | 0.5 |  |  | 0.9 |  |  | 1.0 |  |  | 0.3 |  |  | 1.3 |  |
| Past service credit | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (14.9 | ) |  | — |  |  | (14.9 | ) |
| Curtailment credit | — |  |  | — |  |  | — |  |  | — |  |  | (0.6 | ) |  | (0.6 | ) |  | (3.3 | ) |  | — |  |  | (3.3 | ) |
| Total charge / (credit) for defined benefit plans | 1.6 |  |  | 1.0 |  |  | 2.6 |  |  | 2.2 |  |  | 0.5 |  |  | 2.7 |  |  | (13.3 | ) |  | 0.9 |  |  | (12.4 | ) |
| In respect of defined contribution plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Total charge for defined contribution plans | 1.9 |  |  | 2.1 |  |  | 4.0 |  |  | 1.6 |  |  | 2.1 |  |  | 3.7 |  |  | 1.3 |  |  | 1.8 |  |  | 3.1 |  |
| Total charge / (credit) for pension plans | 3.5 |  |  | 3.1 |  |  | 6.6 |  |  | 3.8 |  |  | 2.6 |  |  | 6.4 |  |  | (12.0 | ) |  | 2.7 |  |  | (9.3 | ) |
Disclosure of value of plan assets | The value of the plans assets were:
|  | 2017 |  | 2017 |  | 2017 |  | 2016 |  | 2016 |  | 2016 |
|  | U.K. |  | Non-U.K. |  | Total |  | U.K. |  | Non-U.K. |  | Total |
|  | $M |  | $M |  | $M |  | $M |  | $M |  | $M |
| Assets in active markets: |  |  |  |  |  |  |  |  |  |  |  |
| Equities and growth funds | 203.4 |  |  | 22.9 |  |  | 226.3 |  |  | 171.6 |  |  | 20.6 |  |  | 192.2 |  |
| Government bonds | 49.9 |  |  | — |  |  | 49.9 |  |  | 44.3 |  |  | — |  |  | 44.3 |  |
| Corporate bonds | 72.7 |  |  | 18.3 |  |  | 91.0 |  |  | 64.5 |  |  | 16.0 |  |  | 80.5 |  |
| Cash | 0.3 |  |  | — |  |  | 0.3 |  |  | (0.1 | ) |  | — |  |  | (0.1 | ) |
| Total market value of assets | 326.3 |  |  | 41.2 |  |  | 367.5 |  |  | 280.3 |  |  | 36.6 |  |  | 316.9 |  |
| Present value of plan liabilities | (369.7 | ) |  | (53.1 | ) |  | (422.8 | ) |  | (334.8 | ) |  | (48.6 | ) |  | (383.4 | ) |
| Deficit in the plans | (43.4 | ) |  | (11.9 | ) |  | (55.3 | ) |  | (54.5 | ) |  | (12.0 | ) |  | (66.5 | ) |
| Related deferred income tax assets | 7.8 |  |  | 3.1 |  |  | 10.9 |  |  | 10.2 |  |  | 4.4 |  |  | 14.6 |  |
| Net pension liabilities | (35.6 | ) |  | (8.8 | ) |  | (44.4 | ) |  | (44.3 | ) |  | (7.6 | ) |  | (51.9 | ) |
Disclosure of sensitivity analysis for actuarial assumptions | The sensitivities regarding the principal assumptions used to measure the present value of the defined benefit obligations are set out below:
| Assumption |  | Change in assumption |  | Impact on total defined benefit obligations |
| Discount rate |  | Increase/decrease by 1.0% |  | Decrease/increase by 18% |
| CPI inflation (and related increases) |  | Increase/decrease by 1.0% |  | Increase/decrease by 10% |
| Post retirement mortality |  | Increase by 1 year |  | Increase by 4% |

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