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Goodwill and Intangible Assets - Assumptions for Our Annual Impairment Assessments of Goodwill (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of information for cash-generating units [line items] |  |  |
Annual revenue growth rate (percentage) | 2.00% |  |
Term used to extrapolate cash flow projections | 5 years |  |
Capital equipment CGU |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Annual revenue growth rate (percentage) | 13.00% | 13.00% | 4.00%
Term used to extrapolate cash flow projections | 5 years | 5 years | 5 years
Discount rate (percentage) | 12.00% | 13.00% | 13.00%
A & D CGU |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Annual revenue growth rate (percentage) | 8.00% |  |
Term used to extrapolate cash flow projections | 5 years | 5 years | 5 years
Discount rate (percentage) | 11.00% | 10.00% | 11.00%
Atrenne CGU |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Annual revenue growth rate (percentage) | 9.00% | 4.00% | 12.00%
Term used to extrapolate cash flow projections | 5 years | 5 years | 4 years
Discount rate (percentage) | 10.00% | 10.00% | 13.00%

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- Definition The discount rate applied to cash flow projections 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 2020-01-01 -Paragraph 134 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_134_d_v&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2020-01-01 -Paragraph 134 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_134_e_v&doctype=Standard -URIDate 2020-01-01 + Details
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