Consolidated Statements Of Shareholders' Equity (USD $) In Millions, unless otherwise specified	Total	Total PolyOne shareholders' equity	Common Shares	Common Shares Held in Treasury	Additional Paid-in Capital	Retained Earnings (Deficit)	Accumulated Other Comprehensive (Loss)	Non-controlling Interests	Total equity
Balance at Dec. 31, 2011		$ 588.3	$ 1.2	$ (369.4)	$ 1,042.7	$ (84.9)	$ (1.3)	$ 0	$ 588.3
Balance, Common shares at Dec. 31, 2011			122.2
Balance, Treasury shares at Dec. 31, 2011				(33.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	71.8	71.9				71.9		(0.1)	71.8
Other comprehensive income (loss)	(9.8)	(9.8)					(9.8)		(9.8)
Noncontrolling interest activity								2.4	2.4
Cash dividends declared		(17.8)			(17.8)				(17.8)
Repurchase of common shares		(15.9)		(15.9)					(15.9)
Repurchase of common shares, shares				(1.2)
Stock-based compensation and exercise of awards		12.4		21.2	(8.8)				12.4
Stock-based compensation and exercise of awards, shares				1.9
Balance at Dec. 31, 2012		629.1	1.2	(364.1)	1,016.1	(13.0)	(11.1)	2.3	631.4
Balance, Common shares at Dec. 31, 2012			122.2
Balance, Treasury shares at Dec. 31, 2012				(32.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	242.7	243.8				243.8		(1.1)	242.7
Other comprehensive income (loss)	(3.7)	(3.7)					(3.7)		(3.7)
Noncontrolling interest activity								0.5	0.5
Shares issued in connection with acquisitions		253.8		117.2	136.6				253.8
Shares issued in connection with acquisitions				10.0
Cash dividends declared		(24.6)			(5.4)	(19.2)			(24.6)
Repurchase of common shares		(131.6)		(131.6)					(131.6)
Repurchase of common shares, shares				(5.0)
Stock-based compensation and exercise of awards		10.0		7.5	2.5				10.0
Stock-based compensation and exercise of awards, shares				0.6
Balance at Dec. 31, 2013	978.5	976.8	1.2	(371.0)	1,149.8	211.6	(14.8)	1.7	978.5
Balance, Common shares at Dec. 31, 2013			122.2
Balance, Treasury shares at Dec. 31, 2013	(27.1)			(27.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	78.4	79.2				79.2		(0.8)	78.4
Other comprehensive income (loss)	(27.5)	(27.5)					(27.5)		(27.5)
Cash dividends declared		(31.1)				(31.1)			(31.1)
Repurchase of common shares		(233.2)		(233.2)					(233.2)
Repurchase of common shares, shares				(6.3)
Stock-based compensation and exercise of awards		12.1		6.5	5.6				12.1
Stock-based compensation and exercise of awards, shares				0.5
Balance at Dec. 31, 2014	$ 777.2	$ 776.3	$ 1.2	$ (597.7)	$ 1,155.4	$ 259.7	$ (42.3)	$ 0.9	$ 777.2
Balance, Common shares at Dec. 31, 2014			122.2
Balance, Treasury shares at Dec. 31, 2014	(32.9)			(32.9)