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Related parties transactions - Key management compensation (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) numberOfCases | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Related Party [Abstract] |  |  |
Number of key management personnel | numberOfCases | 7 |  |
Cash and other compensation | $ 12.8 | $ 12.5 | $ 10.3
Post-employment benefits | 1.1 | 0.9 | 0.8
Equity-based compensation | 9.2 | 10.7 | 11.3
Total | $ 23.1 | $ 24.1 | $ 22.4

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- Definition Key Management Personnel Compensation, Cash And Other Compensation + References No definition available. + Details
Name: | alc_KeyManagementPersonnelCompensationCashAndOtherCompensation
Namespace Prefix: | alc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Number Of Key Management Personnel + References No definition available. + Details
Name: | alc_NumberOfKeyManagementPersonnel
Namespace Prefix: | alc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Related Party [Abstract] + References No definition available. + Details
Name: | alc_RelatedPartyAbstract
Namespace Prefix: | alc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2020-01-01 -Paragraph 17 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2020-en-r&anchor=para_17&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_KeyManagementPersonnelCompensation
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of compensation to key management personnel in the form of post-employment benefits. [Refer: Key management personnel of entity or parent [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2020-01-01 -Paragraph 17 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2020-en-r&anchor=para_17_b&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_KeyManagementPersonnelCompensationPostemploymentBenefits
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2020-01-01 -Paragraph 17 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2020-en-r&anchor=para_17_e&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration