Consolidated Statements Of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Sales	$ 3,377.6	$ 3,835.5	$ 3,771.2
Cost of sales	2,696.1	3,127.6	3,109.0
Gross margin	681.5	707.9	662.2
Selling and administrative expense	430.6	552.8	457.6
Income related to previously owned equity affiliates	0.0	0.0	26.9
Operating income	250.9	155.1	231.5
Interest expense, net	(64.1)	(62.2)	(63.5)
Debt extinguishment costs	(16.4)	0.0	(15.8)
Other expense, net	(2.7)	(4.5)	(1.2)
Income from continuing operations, before income taxes	167.7	88.4	151.0
Income tax expense	(23.0)	(11.2)	(58.1)
Net income from continuing operations	144.7	77.2	92.9
Income from discontinued operations, net of income taxes	0.0	1.2	149.8
Net income	144.7	78.4	242.7
Net (income) loss attributable to noncontrolling interests	(0.1)	0.8	1.1
Net income attributable to PolyOne common shareholders	$ 144.6	$ 79.2	$ 243.8
Earnings per share attributable to PolyOne common shareholders - basic:
Continuing operations (in usd per share)	$ 1.65	$ 0.85	$ 0.98
Discontinued operations (in usd per share)	0.00	0.01	1.57
Total (in usd per share)	1.65	0.86	2.55
Earnings per share attributable to PolyOne common shareholders - diluted:
Continuing operations (in usd per share)	1.63	0.83	0.97
Discontinued operations (in usd per share)	0.00	0.02	1.56
Total (in usd per share)	1.63	0.85	2.53
Cash dividends declared per common share (in usd per share)	$ 0.42	$ 0.34	$ 0.26
Weighted-average number of common shares outstanding:
Basic (in shares)	87.8	92.3	95.5
Diluted (in shares)	88.7	93.5	96.5