Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 230.6	$ 133.4	$ 588.8
Other comprehensive (loss) income, net of tax:
Translation adjustments and related hedging instruments	(75.2)	110.6	2.2
Cash flow hedges	3.2	(1.6)	(2.5)
Total other comprehensive (loss) income	(72.0)	109.0	(0.3)
Total comprehensive income	158.6	242.4	588.5
Comprehensive loss (income) attributable to noncontrolling interests	0.2	(1.8)	(0.2)
Comprehensive income attributable to Avient common shareholders	$ 158.8	$ 240.6	$ 588.3