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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of information for cash-generating units [line items] |  |  |
Annual revenue growth rate | 2.00% |  |
Capital equipment CGU |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Annual revenue growth rate | 4.00% | 9.00% | 7.00%
Term used to extrapolate cash flow projections | 5 years | 6 years | 7 years
Discount rate | 13.00% | 17.00% | 17.00%
A & D CGU |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Term used to extrapolate cash flow projections | 5 years | 4 years |
Discount rate | 11.00% | 9.00% |
Atrenne CGU |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Annual revenue growth rate | 12.00% |  |
Term used to extrapolate cash flow projections | 4 years |  |
Discount rate | 13.00% |  |

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