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, 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	76.2	75.7				75.7		0.5
Other comprehensive income (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, Treasury shares (in shares) at Dec. 31, 2023				(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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	170.7	169.5				169.5		1.2
Other comprehensive income (loss)	(90.4)	(90.4)					(90.4)
Noncontrolling interest activity	(3.9)	0.3			0.3			(4.2)
Cash dividends declared	(95.2)	(95.2)				(95.2)
Share-based compensation and exercise of awards (in shares)				0.2
Share-based compensation and exercise of awards	$ 10.4	10.4		$ 2.9	7.5
Ending balance (in shares) at Dec. 31, 2024			122.2
Ending balance, Treasury shares (in shares) at Dec. 31, 2024	(30.8)			(30.8)
Ending balance at Dec. 31, 2024	$ 2,329.6	2,313.8	$ 1.2	$ (929.6)	1,537.5	1,882.5	(177.8)	15.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	83.6	81.9				81.9		1.7
Other comprehensive income (loss)	71.1	71.1					71.1
Noncontrolling interest activity	(5.4)							(5.4)
Cash dividends declared	(99.3)	(99.3)				(99.3)
Share-based compensation and exercise of awards (in shares)				0.2
Share-based compensation and exercise of awards	$ 6.7	6.7		$ 1.8	4.9
Ending balance (in shares) at Dec. 31, 2025			122.2
Ending balance, Treasury shares (in shares) at Dec. 31, 2025	(30.6)			(30.6)
Ending balance at Dec. 31, 2025	$ 2,386.3	$ 2,374.2	$ 1.2	$ (927.8)	$ 1,542.4	$ 1,865.1	$ (106.7)	$ 12.1