Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 23.2	$ 42.1	$ 56.0	$ 80.4
Other comprehensive income (loss), net of tax:
Translation adjustments and related hedging instruments	4.6	1.6	(2.7)	5.8
Cash flow hedges	0.2	(1.9)	(3.2)	(2.9)
Total other comprehensive income (loss)	4.8	(0.3)	(5.9)	2.9
Total comprehensive income	28.0	41.8	50.1	83.3
Comprehensive income attributable to noncontrolling interests	(0.4)	0.0	(0.4)	(0.1)
Comprehensive income attributable to Avient common shareholders	$ 27.6	$ 41.8	$ 49.7	$ 83.2