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Segment and Geographic Information - Additional Information (Details)	12 Months Ended
	Dec. 31, 2021 segment
Operating Segments [Abstract]
Number of operating segments	2
Number of reportable segments	2

X

- Definition

Number of Operating Segments1

+ References

No definition available.

+ Details

Name:	cls_NumberofOperatingSegments1
Namespace Prefix:	cls_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- 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