Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Sales	$ 4,818.8	$ 3,242.1	$ 2,862.7
Cost of sales	3,719.2	2,457.8	2,205.5
Gross margin	1,099.6	784.3	657.2
Selling and administrative expense	718.4	595.0	500.4
Operating income	381.2	189.3	156.8
Interest expense, net	(75.3)	(74.6)	(59.5)
Other (expense) income, net	(1.3)	24.3	12.1
Income from continuing operations before income taxes	304.6	139.0	109.4
Income tax expense	(74.0)	(5.2)	(33.7)
Net income from continuing operations	230.6	133.8	75.7
(Loss) income from discontinued operations, net of income taxes	0.0	(0.4)	513.1
Net income	230.6	133.4	588.8
Net loss (income) attributable to noncontrolling interests	0.2	(1.8)	(0.2)
Net income attributable to Avient common shareholders	$ 230.8	$ 131.6	$ 588.6
Earnings per share attributable to Avient common shareholders - Basic:
Continuing operations (in usd per share)	$ 2.53	$ 1.47	$ 0.98
Discontinued operations (in usd per share)	0	(0.01)	6.64
Total (in usd per share)	2.53	1.46	7.62
Earnings per share attributable to Avient common shareholders - Diluted:
Continuing operations (in usd per share)	2.51	1.46	0.97
Discontinued operations (in usd per share)	0	(0.01)	6.61
Total (in usd per share)	$ 2.51	$ 1.45	$ 7.58
Weighted-average shares used to compute earnings per common share:
Basic (in shares)	91.4	90.1	77.2
Plus dilutive impact of share-based compensation (in shares)	0.7	0.5	0.5
Diluted (in shares)	92.1	90.6	77.7
Anti-dilutive shares not included in diluted common shares outstanding (in shares)	0.0	0.8	0.6
Cash dividends declared per share of common stock (in dollars per share)	$ 0.875	$ 0.820	$ 0.788