Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Sales	$ 823.3	$ 818.0	$ 2,606.5	$ 2,508.5
Cost of sales	627.9	602.4	1,895.8	1,781.2
Gross margin	195.4	215.6	710.7	727.3
Selling and administrative expense	154.8	162.8	467.8	497.7
Operating income	40.6	52.8	242.9	229.6
Interest expense, net	(37.3)	(19.0)	(70.4)	(57.8)
Other (expense) income, net	(32.3)	1.6	(31.3)	4.3
(Loss) income from continuing operations before income taxes	(29.0)	35.4	141.2	176.1
Income tax benefit (expense)	1.2	(2.0)	(41.5)	(32.1)
Net (loss) income from continuing operations	(27.8)	33.4	99.7	144.0
Income from discontinued operations, net of income taxes	17.1	19.2	58.8	57.7
Net (loss) income	(10.7)	52.6	158.5	201.7
Net loss (income) attributable to noncontrolling interests	0.4	0.3	0.1	(0.7)
Net (loss) income attributable to Avient common shareholders	$ (10.3)	$ 52.9	$ 158.6	$ 201.0
(Loss) earnings per share attributable to Avient common shareholders - Basic
Continuing operations (in USD per share)	$ (0.30)	$ 0.37	$ 1.09	$ 1.57
Discontinued operations (in USD per share)	0.19	0.21	0.65	0.63
Total (in USD per share)	(0.11)	0.58	1.74	2.20
(Loss) earnings per share attributable to Avient common shareholders - Diluted
Continuing operations (in USD per share)	(0.30)	0.37	1.08	1.56
Discontinued operations (in USD per share)	0.19	0.20	0.64	0.62
Total (in USD per share)	$ (0.11)	$ 0.57	$ 1.72	$ 2.18
Weighted-average shares used to compute earnings per common share:
Basic (in shares)	90.9	91.4	91.3	91.3
Dilutive impact of share-based compensation (in shares)	0.0	0.8	0.7	0.8
Diluted (in shares)	90.9	92.2	92.0	92.1
Anti-dilutive shares not included in diluted common shares outstanding (in shares)	1.0	0.0	0.3	0.0
Cash dividends declared per share of common stock (in USD per share)	$ 0.2375	$ 0.2125	$ 0.7125	$ 0.6375