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, 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 income	84.5	84.2				84.2		0.3
Other comprehensive income (loss)	(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, 2022			122.2
Beginning balance, Treasury shares (in shares) at Dec. 31, 2022				(31.3)
Beginning 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	20.4	19.9				19.9		0.5
Other comprehensive income (loss)	16.1	16.1					16.1
Cash dividends declared	(22.5)	(22.5)				(22.5)
Share-based compensation and exercise of awards	1.9	1.9		$ 1.4	0.5
Ending balance (in shares) at Mar. 31, 2023			122.2
Ending balance, Treasury shares (in shares) at Mar. 31, 2023				(31.3)
Ending balance at Mar. 31, 2023	$ 2,368.6	$ 2,349.8	$ 1.2	$ (933.6)	$ 1,521.0	$ 1,820.9	$ (59.7)	$ 18.8