Consolidated Statements of Shareholders' Equity (Unaudited) - 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, Treasury shares (in shares) at Dec. 31, 2020				(30.8)
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 (loss) income	79.7	79.3				79.3		0.4
Other comprehensive (loss) income	(50.2)	(50.2)					(50.2)
Cash dividends declared	(19.5)	(19.5)				(19.5)
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)				0.1
Share-based compensation and exercise of awards	4.5	4.5		$ 1.6	2.9
Ending balance (in shares) at Mar. 31, 2021			122.2
Ending balance, Treasury shares (in shares) at Mar. 31, 2021				(30.8)
Ending balance at Mar. 31, 2021	1,722.0	1,707.0	$ 1.2	$ (903.8)	1,516.2	1,117.2	(23.8)	15.0
Beginning balance (in shares) at Dec. 31, 2020			122.2
Beginning balance, Treasury shares (in shares) at Dec. 31, 2020				(30.8)
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 (loss) income	201.7
Other comprehensive (loss) income	(68.7)
Ending balance (in shares) at Sep. 30, 2021			122.2
Ending balance, Treasury shares (in shares) at Sep. 30, 2021				(30.7)
Ending balance at Sep. 30, 2021	1,785.4	1,768.8	$ 1.2	$ (901.6)	1,511.6	1,199.9	(42.3)	16.6
Beginning balance (in shares) at Mar. 31, 2021			122.2
Beginning balance, Treasury shares (in shares) at Mar. 31, 2021				(30.8)
Beginning balance at Mar. 31, 2021	1,722.0	1,707.0	$ 1.2	$ (903.8)	1,516.2	1,117.2	(23.8)	15.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	69.4	68.8				68.8		0.6
Other comprehensive (loss) income	10.2	10.2					10.2
Noncontrolling interest activity	2.6							2.6
Cash dividends declared	(19.4)	(19.4)				(19.4)
Share-based compensation and exercise of awards (in shares)				0.0
Share-based compensation and exercise of awards	1.6	1.6		$ 0.6	1.0
Other	0.0	0.0			0.0			0.0
Ending balance (in shares) at Jun. 30, 2021			122.2
Ending balance, Treasury shares (in shares) at Jun. 30, 2021				(30.8)
Ending balance at Jun. 30, 2021	1,786.4	1,768.2	$ 1.2	$ (903.2)	1,517.2	1,166.6	(13.6)	18.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	52.6	52.9				52.9		(0.3)
Other comprehensive (loss) income	(28.7)	(28.7)					(28.7)
Noncontrolling interest activity	(1.3)							(1.3)
Cash dividends declared	(19.6)	(19.6)				(19.6)
Share-based compensation and exercise of awards (in shares)				0.1
Share-based compensation and exercise of awards	(1.6)	(1.6)		$ 1.6	(3.2)
Other	(2.4)	(2.4)			(2.4)
Ending balance (in shares) at Sep. 30, 2021			122.2
Ending balance, Treasury shares (in shares) at Sep. 30, 2021				(30.7)
Ending balance at Sep. 30, 2021	1,785.4	1,768.8	$ 1.2	$ (901.6)	1,511.6	1,199.9	(42.3)	16.6
Beginning balance (in shares) at Dec. 31, 2021			122.2
Beginning balance, Treasury shares (in shares) at Dec. 31, 2021				(30.6)
Beginning 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 (loss) income	84.5	84.2				84.2		0.3
Other comprehensive (loss) income	(7.9)	(7.9)					(7.9)
Cash dividends declared	(21.7)	(21.7)				(21.7)
Repurchase of common shares (in shares)				(0.3)
Repurchase of common shares	(15.8)	(15.8)		$ (15.8)
Share-based compensation and exercise of awards (in shares)				0.1
Share-based compensation and exercise of awards	(0.3)	(0.3)		$ 1.9	(2.2)
Ending balance (in shares) at Mar. 31, 2022			122.2
Ending balance, Treasury shares (in shares) at Mar. 31, 2022				(30.8)
Ending balance at Mar. 31, 2022	1,829.3	1,813.2	$ 1.2	$ (914.6)	1,509.6	1,270.5	(53.5)	16.1
Beginning balance (in shares) at Dec. 31, 2021			122.2
Beginning balance, Treasury shares (in shares) at Dec. 31, 2021				(30.6)
Beginning 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 (loss) income	158.5
Other comprehensive (loss) income	(118.1)
Ending balance (in shares) at Sep. 30, 2022			122.2
Ending balance, Treasury shares (in shares) at Sep. 30, 2022				(31.3)
Ending balance at Sep. 30, 2022	1,736.1	1,720.4	$ 1.2	$ (935.1)	1,516.4	1,301.6	(163.7)	15.7
Beginning balance (in shares) at Mar. 31, 2022			122.2
Beginning balance, Treasury shares (in shares) at Mar. 31, 2022				(30.8)
Beginning balance at Mar. 31, 2022	1,829.3	1,813.2	$ 1.2	$ (914.6)	1,509.6	1,270.5	(53.5)	16.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	84.7	84.7				84.7		0.0
Other comprehensive (loss) income	(49.3)	(49.3)					(49.3)
Cash dividends declared	(21.7)	(21.7)				(21.7)
Repurchase of common shares (in shares)				(0.5)
Repurchase of common shares	(20.6)	(20.6)		$ (20.6)
Share-based compensation and exercise of awards	3.4	3.4		$ 0.0	3.4
Ending balance (in shares) at Jun. 30, 2022			122.2
Ending balance, Treasury shares (in shares) at Jun. 30, 2022				(31.3)
Ending balance at Jun. 30, 2022	1,825.8	1,809.7	$ 1.2	$ (935.2)	1,513.0	1,333.5	(102.8)	16.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(10.7)	(10.3)				(10.3)		(0.4)
Other comprehensive (loss) income	(60.9)	(60.9)					(60.9)
Cash dividends declared	(21.6)	(21.6)				(21.6)
Share-based compensation and exercise of awards	3.5	3.5		$ 0.1	3.4
Ending balance (in shares) at Sep. 30, 2022			122.2
Ending balance, Treasury shares (in shares) at Sep. 30, 2022				(31.3)
Ending balance at Sep. 30, 2022	$ 1,736.1	$ 1,720.4	$ 1.2	$ (935.1)	$ 1,516.4	$ 1,301.6	$ (163.7)	$ 15.7