Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Sales	$ 847.0	$ 873.1
Cost of sales	661.5	703.3
Gross margin	185.5	169.8
Selling and administrative expense	114.2	99.7
Operating income	71.3	70.1
Interest expense, net	(14.6)	(16.1)
Other income (expense), net	0.3	(0.7)
Income before income taxes	57.0	53.3
Income tax expense	(18.0)	(23.1)
Net income	39.0	30.2
Net loss attributable to noncontrolling interests	0.1	0.0
Net income attributable to PolyOne common shareholders	$ 39.1	$ 30.2
Earnings per common share attributable to PolyOne common shareholders - Basic (USD per share)	$ 0.46	$ 0.34
Earnings per common share attributable to PolyOne common shareholders - Diluted (USD per share)	$ 0.46	$ 0.34
Weighted-average shares used to compute earnings per common share:
Basic (in shares)	84.7	89.2
Diluted (in shares)	85.5	90.1
Cash dividends declared per share of common stock (in usd per share)	$ 0.12	$ 0.10