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Related Party Transactions - Narrative (Details) - Entities with significant influence - USD ($) $ in Thousands |  | 9 Months Ended
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Oct. 18, 2023 | Sep. 30, 2023
Disclosure of transactions between related parties [line items] |  |
Annual fee to be paid for Service Agreement |  | $ 235
Expense from cash-settled share-based payment transactions | $ 9,200 |

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- Definition Services Agreement, Annual Fee, Related Party Transactions + References No definition available. + Details
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Namespace Prefix: | cls_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of expense arising from cash-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_ExpenseFromCashsettledSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_JointControlOrSignificantInfluenceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |