Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
Sales	$ 866.5	$ 849.7	$ 1,693.1	$ 1,678.7
Cost of sales	588.6	592.1	1,152.0	1,142.9
Gross margin	277.9	257.6	541.1	535.8
Selling and administrative expense	181.8	185.1	444.3	369.3
Operating income	96.1	72.5	96.8	166.5
Interest expense, net	(24.7)	(26.6)	(51.6)	(53.2)
Other expense, net	(0.5)	(0.9)	(0.9)	(1.8)
Income before income taxes	70.9	45.0	44.3	111.5
Income tax expense	(17.4)	(11.2)	(10.7)	(28.0)
Net income	53.5	33.8	33.6	83.5
Net income attributable to noncontrolling interests	(0.9)	(0.2)	(1.2)	(0.5)
Net income attributable to Avient common shareholders	$ 52.6	$ 33.6	$ 32.4	$ 83.0
Earnings per share attributable to Avient common shareholders - Basic (in USD per share)	$ 0.57	$ 0.37	$ 0.35	$ 0.91
Earnings per share attributable to Avient common shareholders - Diluted (in USD per share)	$ 0.57	$ 0.36	$ 0.35	$ 0.90
Weighted-average shares used to compute earnings per common share:
Basic (in shares)	91.5	91.3	91.5	91.3
Plus dilutive impact of share-based compensation (in shares)	0.3	0.9	0.3	0.7
Diluted (in shares)	91.8	92.2	91.8	92.0
Anti-dilutive share-based compensation awards (in shares)	1.6	0.4	1.5	1.1
Cash dividends declared per share of common stock (in USD per share)	$ 0.2700	$ 0.2575	$ 0.5400	$ 0.5150