Consolidated Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Total Avient Shareholders' Equity	Common Shares	Common Shares  Held in Treasury	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss (Income)	Non-controlling Interests
Beginning balance (in shares) at Dec. 31, 2020			122.2
Beginning balance (in shares) at Dec. 31, 2020				(30.9)
Beginning balance at Dec. 31, 2020	$ 1,711.7	$ 1,697.1	$ 1.2	$ (901.2)	$ 1,513.3	$ 1,057.4	$ 26.4	$ 14.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	230.6	230.8				230.8		(0.2)
Other comprehensive loss	(72.0)	(72.0)					(72.0)
Noncontrolling interest activity	1.4							1.4
Cash dividends declared	(80.2)	(80.2)				(80.2)
Repurchase of common shares (in shares)				(0.1)
Repurchase of common shares	(4.2)	(4.2)		$ (4.2)
Share-based compensation and exercise of awards (in shares)				0.4
Share-based compensation and exercise of awards	5.6	5.6		$ 4.7	0.9
Acquisitions/other	(2.4)	(2.4)			(2.4)
Ending balance (in shares) at Dec. 31, 2021			122.2
Ending balance (in shares) at Dec. 31, 2021				(30.6)
Ending balance at Dec. 31, 2021	1,790.5	1,774.7	$ 1.2	$ (900.7)	1,511.8	1,208.0	(45.6)	15.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	703.4	703.1				703.1		0.3
Other comprehensive loss	(30.2)	(30.2)					(30.2)
Cash dividends declared	(87.5)	(87.5)				(87.5)
Repurchase of common shares (in shares)				(0.8)
Repurchase of common shares	(36.4)	(36.4)		$ (36.4)
Share-based compensation and exercise of awards (in shares)				0.1
Share-based compensation and exercise of awards	10.8	10.8		$ 2.1	8.7
Acquisitions/other	$ 2.2							2.2
Ending balance (in shares) at Dec. 31, 2022			122.2
Ending balance (in shares) at Dec. 31, 2022	(31.3)			(31.3)
Ending balance at Dec. 31, 2022	$ 2,352.8	2,334.5	$ 1.2	$ (935.0)	1,520.5	1,823.6	(75.8)	18.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	76.2	75.7				75.7		0.5
Other comprehensive loss	(11.6)	(11.6)					(11.6)
Cash dividends declared	$ (91.1)	(91.1)				(91.1)
Share-based compensation and exercise of awards (in shares)	0.3
Share-based compensation and exercise of awards	$ 11.7	11.7		$ 2.5	9.2
Ending balance (in shares) at Dec. 31, 2023			122.2
Ending balance (in shares) at Dec. 31, 2023	(31.0)			(31.0)
Ending balance at Dec. 31, 2023	$ 2,338.0	$ 2,319.2	$ 1.2	$ (932.5)	$ 1,529.7	$ 1,808.2	$ (87.4)	$ 18.8