Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 32.8	$ 38.3
Other comprehensive (loss) income, net of tax:
Translation adjustments and related hedging instruments	(7.3)	4.2
Cash flow hedges	(3.4)	(1.0)
Total other comprehensive (loss) income	(10.7)	3.2
Total comprehensive income	22.1	41.5
Comprehensive income attributable to noncontrolling interests	0.0	(0.1)
Comprehensive income attributable to PolyOne common shareholders	$ 22.1	$ 41.4