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Assets Classified As Held For Sale (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
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Non-current Assets Held For Sale And Discontinued Operations [Abstract] |  |  |  |  |
Assets classified as held for sale | $ 27.4 | $ 30.1 | [1] | $ 28.9 | [1]
[1] | Certain prior period figures have been restated to reflect the adoption of IFRS 15 (see note 2)

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- Definition Non-current Assets Held For Sale And Discontinued Operations [Abstract] + References No definition available. + Details
Name: | cls_NoncurrentAssetsHeldForSaleAndDiscontinuedOperationsAbstract
Namespace Prefix: | cls_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of current assets other than non-current assets or disposal groups classified as held for sale or as held for distribution to owners. [Refer: Current assets; Disposal groups classified as held for sale [member]; Non-current assets or disposal groups classified as held for sale; Non-current assets or disposal groups classified as held for distribution to owners] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_66&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_CurrentAssetsOtherThanAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant