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Goodwill and Intangible Assets - Additional Information (Details) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 30, 2018 | Apr. 30, 2018 | Jan. 01, 2017 | [1] | Nov. 30, 2016
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |  |  |  |  |
Impairment charges against goodwill or intangible assets | $ 0 | $ 0 |  | $ 0 |  |  |  |
Growth rate used to extrapolate cash flow projections | 2.00% |  |  |  |  |  |  |
Intangible assets and goodwill | $ 482,000,000 | 44,800,000 |  | 48,700,000 |  |  |  |
Goodwill | 198,400,000 | 23,200,000 | [1] |  |  |  | $ 23,200,000 |
Goodwill |  |  |  |  |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |  |  |  |  |
Intangible assets and goodwill | $ 198,400,000 | $ 23,200,000 |  | $ 23,200,000 |  |  |  |
Impakt |  |  |  |  |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 111,200,000 |  |  |
Acquisitions prior to Impakt acquisition |  |  |  |  |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 19,500,000 |  |  |
Karel |  |  |  |  |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 3,700,000
Atrenne |  |  |  |  |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 64,000,000 |  |
Bottom of range |  |  |  |  |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |  |  |  |  |
Term used to extrapolate cash flow projections | 4 years |  |  |  |  |  |  |
Top of range |  |  |  |  |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |  |  |  |  |
Term used to extrapolate cash flow projections | 5 years |  |  |  |  |  |  |
[1] | Certain prior period figures have been restated to reflect the adoption of IFRS 15 (see note 2)

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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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