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Pension and Non-pension Post-employment Benefit Plans - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of defined benefit plans [line items] |  |  |  |
Percentage of plan members that are active employees of the Company |  | 1.00% |  |
Loss on pension annuity purchases (see note 18(a)) | $ 0.2 | $ 0.0 | $ 0.2 | $ 0.0
Plan assets, at fair value |  | $ 361.9 | 380.1 |
Percentage of plan assets held with financial institutions with a rating of A- or above |  | 96.00% |  |
Number of basis points |  | 1.00% |  |
Pension Plan |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Plan assets, at fair value |  | $ 359.9 | 378.1 |
Plan assets, decrease due to restrictions |  | (1.6) | 0.0 |
Level 1 |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Plan assets, at fair value |  | 33.2 | 31.8 |
Level 3 |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Plan assets, at fair value |  | $ 328.7 | $ 348.3 |

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- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_57_a&doctype=Standard -URIDate 2021-03-24 + Details
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