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Segment and Geographic Information - Narrative (Details) | 12 Months Ended
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Dec. 31, 2023 segment
Operating Segments [Abstract] |
Number of operating segments | 2
Number of reportable segments | 2

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- Definition Number of Operating Segments1 + References No definition available. + Details
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Namespace Prefix: | cls_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of Reportable Segments + References No definition available. + Details
Name: | cls_NumberofReportableSegments1
Namespace Prefix: | cls_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Operating Segments [Abstract] + References No definition available. + Details
Name: | cls_OperatingSegmentsAbstract
Namespace Prefix: | cls_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration