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EMPLOYEE BENEFIT PLANS - Schedule of Contributions to the Retirement Savings Plan (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Retirement Benefits [Abstract] |  |  |
Retirement savings match | $ 11.8 | $ 11.9 | $ 12.7

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- Definition Defined Contribution Plan Employer Matching Contributions + References No definition available. + Details
Name: | avnt_DefinedContributionPlanEmployerMatchingContributions
Namespace Prefix: | avnt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration