XML 141 R111.htm IDEA: XBRL DOCUMENT
v3.19.1

Segment and Geographic Information - Revenue By Segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of operating segments [line items] |  |  |  |  |
Revenue | $ 6,633.2 | $ 6,142.7 | [1] | $ 6,046.6 | [1]
ATS |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
Revenue | $ 2,209.7 | $ 1,958.6 |  | $ 1,954.2 |
Percentage of entity's revenue | 33.00% | 32.00% |  | 32.00% |
CCS |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
Revenue | $ 4,423.5 | $ 4,184.1 |  | $ 4,092.4 |
Percentage of entity's revenue | 67.00% | 68.00% |  | 68.00% |
[1] | Certain prior period figures have been restated to reflect the adoption of IFRS 15 (see note 2)

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

X
- Definition The percentage of the entity's revenue. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 8 -IssueDate 2017-01-01 -Paragraph 34 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2017-03-01&anchor=para_34&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_PercentageOfEntitysRevenue
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 15 -IssueDate 2017-01-01 -Paragraph 113 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2017-03-01&anchor=para_113_a&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 15 -IssueDate 2017-01-01 -Paragraph 114 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2017-03-01&anchor=para_114&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_RevenueFromContractsWithCustomers
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_SegmentsAxis=cls_AdvancedTechnologySolutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cls_ConnectivityCloudSolutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |