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Goodwill - Impairment assumptions (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Image-Guided Therapy [Member] |  |  |  |  |
Goodwill [Line items] |  |  |  |  |
Initial forecast period |  | 5.30% | [1] | 7.10% | [2]
Extra-polation period |  | 4.00% | [1],[3] | 5.60% | [2],[4]
Used to calculate terminal value |  | 2.30% | [1],[5] | 2.70% | [2],[6]
Pre-tax discount rates |  | 10.90% |  | 12.10% |
Patient Care & Monitoring Solutions [Member] |  |  |  |  |
Goodwill [Line items] |  |  |  |  |
Initial forecast period |  | 3.80% | [1] | 6.40% | [2]
Extra-polation period |  | 4.80% | [1],[3] | 4.60% | [2],[4]
Used to calculate terminal value |  | 2.30% | [1],[5] | 2.70% | [2],[6]
Pre-tax discount rates |  | 12.30% |  | 14.30% |
Sleep & Respiratory Care [Member] |  |  |  |  |
Goodwill [Line items] |  |  |  |  |
Initial forecast period |  | 7.20% | [1] | 6.80% | [2]
Extra-polation period |  | 5.60% | [1],[3] | 4.60% | [2],[4]
Used to calculate terminal value |  | 2.30% | [1],[5] | 2.70% | [2],[6]
Pre-tax discount rates |  | 12.10% |  | 12.60% |
Professional [Member] |  |  |  |  |
Goodwill [Line items] |  |  |  |  |
Initial forecast period | [2] |  |  | 5.00% |
Extra-polation period | [2],[4] |  |  | 4.30% |
Used to calculate terminal value | [2],[6] |  |  | 2.70% |
Pre-tax discount rates |  |  |  | 13.90% |
[1] | Compound sales growth rate is the annualized steady growth rate over the forecast period
[2] | Compound sales growth rate is the annualized steady growth rate over the forecast period
[3] | Also referred to later in the text as compound long-term sales growth rate
[4] | Also referred to later in the text as compound long-term sales growth rate
[5] | The historical long-term growth rate is only applied to the first year after the 5 year extrapolation period, after which no further growth is assumed for the terminal value calculation
[6] | The historical long-term growth rate is only applied to the first year after the 5 year extrapolation period, after which no further growth is assumed for the terminal value calculation

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- Definition The growth rate used to extrapolate cash flow projections beyond the period covered by the most recent budgets/forecasts for a cash-generating unit (group of units). [Refer: Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 134 -Subparagraph d -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134_d_iv&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 134 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134_e_iv&doctype=Standard -URIDate 2017-03-09 + Details
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