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EMPLOYEE BENEFIT PLANS - Schedule of Contributions to the Retirement Savings Plan (Details) - USD ($) $ in Millions	12 Months Ended
	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