Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Statement [Abstract]
Sales	$ 3,260.2	$ 3,240.4	$ 3,142.8
Cost of sales	2,244.6	2,183.7	2,250.3
Gross margin	1,015.6	1,056.7	892.5
Selling and administrative expense	812.1	727.4	695.7
Operating income	203.5	329.3	196.8
Interest expense, net	(98.6)	(105.6)	(115.3)
Other income, net	6.8	1.1	5.8
Income from continuing operations before income taxes	111.7	224.8	87.3
Income tax expense	(28.1)	(54.1)	(11.0)
Net income from continuing operations	83.6	170.7	76.3
Loss from discontinued operations, net of income taxes	0.0	0.0	(0.1)
Net income	83.6	170.7	76.2
Net income attributable to noncontrolling interests	(1.7)	(1.2)	(0.5)
Net income attributable to Avient common shareholders	$ 81.9	$ 169.5	$ 75.7
Earnings per share attributable to Avient common shareholders - Basic (in USD per share)	$ 0.90	$ 1.86	$ 0.83
Earnings per share attributable to Avient common shareholders - Diluted (in USD per share)	$ 0.89	$ 1.84	$ 0.83
Weighted-average shares used to compute earnings per common share:
Basic (in shares)	91.5	91.3	91.1
Plus dilutive impact of share-based compensation (in shares)	0.3	0.7	0.7
Diluted (in shares)	91.8	92.0	91.8
Anti-dilutive shares not included in diluted common shares outstanding (in shares)	1.6	0.4	0.7
Cash dividends declared per share of common stock (in USD per share)	$ 1.0850	$ 1.0425	$ 1.0000