XML 116 R86.htm IDEA: XBRL DOCUMENT
v3.19.1

Pension and Non-pension Post-employment Benefit Plans - Additional Information (Details) £ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2018 GBP (£) | Apr. 30, 2017 USD ($) | Apr. 30, 2017 GBP (£) | Mar. 31, 2017 USD ($) | Mar. 31, 2017 GBP (£) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Disclosure of fair value of plan assets [line items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of plan members that are active employees of the Company |  |  |  |  |  |  |  |  |  | 1.00% |  |
Loss (gain) on pension annuity purchase |  |  |  |  |  |  | $ 63,300,000 | $ 1,900,000 |  | $ 0 | $ 1,900,000 | $ 0
Plan assets, at fair value |  |  |  |  |  |  |  |  |  | $ 293,000,000 | 395,500,000 |
Percentage of plan assets held with financial institutions with a rating of A- or above |  |  |  |  |  |  |  |  |  | 97.00% |  |
Level 1 |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |  |  |  |  |  |  |  |  |
Plan assets, at fair value |  |  |  |  |  |  |  |  |  | $ 26,500,000 | 247,000,000 |
Level 3 |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |  |  |  |  |  |  |  |  |
Plan assets, at fair value |  |  |  |  |  |  |  |  |  | 266,500,000 | 148,500,000 |
Level 2 |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |  |  |  |  |  |  |  |  |
Plan assets, at fair value |  |  |  |  |  |  |  |  |  | 0 | 0 |
UK Main Pension Plan |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |  |  |  |  |  |  |  |  |
Cost of annuity purchased | $ 209,200,000 | £ 156.1 |  |  | $ 154,300,000 | £ 123.7 |  |  |  |  |  |
Non-cash loss recorded in other comprehensive income |  |  |  |  |  |  |  |  | $ 17,000,000 | 63,300,000 | 17,000,000 |
Reduction in pension assets |  |  |  |  |  |  |  |  | $ 17,000,000 |  |  |
UK Supplementary Pension Plan |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |  |  |  |  |  |  |  |  |
Cost of annuity purchased |  |  | $ 11,700,000 | £ 9.1 |  |  |  |  |  |  |  |
Loss (gain) on pension annuity purchase |  |  |  |  |  |  |  |  |  |  | 1,900,000 |
Pension Plans |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |  |  |  |  |  |  |  |  |
Plan assets, at fair value |  |  |  |  |  |  |  |  |  | 293,000,000 | 395,500,000 |
Employer contributions |  |  |  |  |  |  |  |  |  | 13,300,000 | 11,900,000 |
Defined Contribution Pension Plans |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |  |  |  |  |  |  |  |  |
Employer contributions |  |  |  |  |  |  |  |  |  | 9,600,000 | 9,400,000 |
Estimate of contributions expected to be paid to plan for next annual reporting period |  |  |  |  |  |  |  |  |  | 9,600,000 |  |
Defined Benefit Pension Plans |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |  |  |  |  |  |  |  |  |
Employer contributions |  |  |  |  |  |  |  |  |  | 3,700,000 | 2,500,000 |
Estimate of contributions expected to be paid to plan for next annual reporting period |  |  |  |  |  |  |  |  |  | 2,400,000 |  |
Other Benefit Plans |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |  |  |  |  |  |  |  |  |
Plan assets, at fair value |  |  |  |  |  |  |  |  |  | 0 | 0 |
Employer contributions |  |  |  |  |  |  |  |  |  | 4,800,000 | $ 4,500,000 |
Estimate of contributions expected to be paid to plan for next annual reporting period |  |  |  |  |  |  |  |  |  | $ 3,600,000 |  |

X
- Definition Gain (Loss) on Purchase of Annuity Recognised in Other Comprehensive Income + References No definition available. + Details
Name: | cls_GainLossonPurchaseofAnnuityRecognisedinOtherComprehensiveIncome
Namespace Prefix: | cls_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Gain (Loss) on Purchase of Annuity Recognised in Profit Or Loss + References No definition available. + Details
Name: | cls_GainLossonPurchaseofAnnuityRecognisedinProfitOrLoss
Namespace Prefix: | cls_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of Participants Of Retirement Benefit Plan Receiving Benefits, Percentage + References No definition available. + Details
Name: | cls_NumberofParticipantsOfRetirementBenefitPlanReceivingBenefitsPercentage
Namespace Prefix: | cls_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage Of Plan Assets Held With Financial Institutions With A Rating Of A- Or Above + References No definition available. + Details
Name: | cls_PercentageOfPlanAssetsHeldWithFinancialInstitutionsWithARatingOfAOrAbove
Namespace Prefix: | cls_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Plan Assets, Cost of Annuity Purchased + References No definition available. + Details
Name: | cls_PlanAssetsCostofAnnuityPurchased
Namespace Prefix: | cls_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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_DisclosureOfFairValueOfPlanAssetsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of employer contributions to retirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2017-01-01 -Paragraph 35 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=26&date=2017-03-01&anchor=para_35_b_i&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_EmployerContributions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 147 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_147_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_148_d_iii&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_EstimateOfContributionsExpectedToBePaidToPlan
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_g&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_PaymentsFromPlanNetDefinedBenefitLiabilityAsset
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_PlanAssetsAtFairValue
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level1OfFairValueHierarchyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level3OfFairValueHierarchyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level2OfFairValueHierarchyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=cls_UKMainPensionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=cls_UKSupplementaryPensionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=cls_PensionPlansDefinedBenefit1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=cls_DefinedContributionPensionPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=cls_DefinedBenefitPensionPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=cls_OtherPostretirementBenefitPlansDefinedBenefit1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |