Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 83.6	$ 170.7	$ 76.2
Other comprehensive income (loss), net of tax:
Translation adjustments and related hedging instruments	71.1	(90.4)	(5.3)
Pension and postretirement benefits	0.0	0.0	(6.3)
Total other comprehensive income (loss)	71.1	(90.4)	(11.6)
Total comprehensive income	154.7	80.3	64.6
Comprehensive income attributable to noncontrolling interests	(1.7)	(1.2)	(0.5)
Comprehensive income attributable to Avient common shareholders	$ 153.0	$ 79.1	$ 64.1