Consolidated Statements Of Income (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Sales	$ 3,835.5	$ 3,771.2	$ 2,860.8
Cost of sales	3,127.6	3,109.0	2,329.7
Gross margin	707.9	662.2	531.1
Selling and administrative expense	552.8	457.6	417.0
Income related to previously owned equity affiliates	0	26.9	23.4
Operating income	155.1	231.5	137.5
Interest expense, net	(62.2)	(63.5)	(50.8)
Debt extinguishment costs	0	(15.8)	0
Other expense, net	(4.5)	(1.2)	(3.4)
Income from continuing operations, before income taxes	88.4	151.0	83.3
Income tax expense	(11.2)	(58.1)	(30.1)
Net income from continuing operations	77.2	92.9	53.2
Income from discontinued operations, net of income taxes	1.2	149.8	18.6
Net income	78.4	242.7	71.8
Net loss attributable to noncontrolling interests	0.8	1.1	0.1
Net income attributable to PolyOne common shareholders	$ 79.2	$ 243.8	$ 71.9
Earnings per share attributable to PolyOne common shareholders - basic:
Continuing operations	$ 0.85	$ 0.98	$ 0.60
Discontinued operations	$ 0.01	$ 1.57	$ 0.21
Total	$ 0.86	$ 2.55	$ 0.81
Continuing operations	$ 0.83	$ 0.97	$ 0.59
Discontinued operations	$ 0.02	$ 1.56	$ 0.21
Total	$ 0.85	$ 2.53	$ 0.80
Cash dividends declared per common share	$ 0.34	$ 0.26	$ 0.20
Weighted-average number of common shares outstanding:
Basic (in shares)	92.3	95.5	89.1
Diluted (in shares)	93.5	96.5	89.8