XML 158 R102.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Financial Instruments and Risk Management - Currency Risk (Details) - Currency risk $ in Millions | Dec. 31, 2017 USD ($)
--- | ---
Cash and cash equivalents | Canadian dollar |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | $ 9.6
Cash and cash equivalents | British pound sterling |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | 0.3
Cash and cash equivalents | Euro |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | 8.6
Cash and cash equivalents | Thai baht |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | 1.3
Accounts receivable | Canadian dollar |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | 0.6
Accounts receivable | British pound sterling |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | 0.0
Accounts receivable | Euro |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | 28.5
Accounts receivable | Thai baht |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | 1.5
Pension and non-pension post-employment assets | Canadian dollar |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | 0.0
Pension and non-pension post-employment assets | British pound sterling |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | 55.0
Pension and non-pension post-employment assets | Euro |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | 0.0
Pension and non-pension post-employment assets | Thai baht |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | 0.0
Income taxes and value-added taxes receivable | Canadian dollar |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | 16.3
Income taxes and value-added taxes receivable | British pound sterling |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | 0.0
Income taxes and value-added taxes receivable | Euro |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | 18.5
Income taxes and value-added taxes receivable | Thai baht |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | 6.3
Other financial assets | Canadian dollar |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | 6.7
Other financial assets | British pound sterling |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | 0.0
Other financial assets | Euro |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | 1.7
Other financial assets | Thai baht |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | 0.2
Pension and non-pension post-employment liabilities | Canadian dollar |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | (74.2)
Pension and non-pension post-employment liabilities | British pound sterling |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | 0.0
Pension and non-pension post-employment liabilities | Euro |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | (0.5)
Pension and non-pension post-employment liabilities | Thai baht |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | (12.0)
Income taxes and value-added taxes payable | Canadian dollar |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | (2.6)
Income taxes and value-added taxes payable | British pound sterling |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | 0.0
Income taxes and value-added taxes payable | Euro |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | (1.2)
Income taxes and value-added taxes payable | Thai baht |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | (0.8)
Accounts payable and certain accrued and other liabilities and provisions | Canadian dollar |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | (55.8)
Accounts payable and certain accrued and other liabilities and provisions | British pound sterling |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | (0.9)
Accounts payable and certain accrued and other liabilities and provisions | Euro |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | (33.0)
Accounts payable and certain accrued and other liabilities and provisions | Thai baht |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | (18.0)
Net financial assets (liabilities) | Canadian dollar |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | (99.4)
Net financial assets (liabilities) | British pound sterling |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | 54.4
Net financial assets (liabilities) | Euro |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | 22.6
Net financial assets (liabilities) | Thai baht |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Risk exposure associated with instruments sharing characteristic | $ (21.5)

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

X
- Definition The amount of risk exposure associated with financial instruments with a shared characteristic that identifies a concentration of risks. [Refer: Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph B8 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_B8_c&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
Name: | ifrs-full_RiskExposureAssociatedWithInstrumentsSharingCharacteristic
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=cls_CashandCashEquivalents1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cls_Currency1Axis=currency_CAD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRisksAxis=ifrs-full_CurrencyRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cls_Currency1Axis=currency_GBP
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cls_Currency1Axis=currency_EUR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cls_Currency1Axis=currency_THB
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=ifrs-full_TradeReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=cls_AssetsForPlanBenefitsDefinedBenefitPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=cls_CurrentTaxAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=cls_OtherFinancialAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=cls_LiabilityForPlanBenefitsDefinedBenefitPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=cls_CurrentTaxLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=cls_TradePayablesAccruedLiabilitiesOtherLiabilitiesAndProvisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=cls_NetFinancialAssetsLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |