Consolidated Statements Of Shareholders' Equity - USD ($) $ in Millions	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
Beginning Balance at Dec. 31, 2012		$ 629.1	$ 1.2	$ (364.1)	$ 1,016.1	$ (13.0)	$ (11.1)	$ 2.3	$ 631.4
Beginning Balance, Treasury shares (in shares) at Dec. 31, 2012				(32,700,000.0)
Beginning Balance, Common shares (in shares) at Dec. 31, 2012			122,200,000.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 242.7	243.8				243.8		(1.1)	242.7
Other comprehensive loss		(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 (in shares)				10,000,000
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 (in shares)				(5,000,000)
Stock-based compensation and exercise of awards		10.0		$ 7.5	2.5				10.0
Stock-based compensation and exercise of awards (in shares)				600,000.0
Ending Balance at Dec. 31, 2013		976.8	$ 1.2	$ (371.0)	$ 1,149.8	211.6	(14.8)	1.7	978.5
Ending Balance, Treasury shares (in shares) at Dec. 31, 2013				(27,100,000.0)
Ending Balance, Common shares (in shares) at Dec. 31, 2013			122,200,000.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	78.4	79.2				79.2		(0.8)	78.4
Other comprehensive loss		(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 (in shares)				(6,300,000.0)
Stock-based compensation and exercise of awards		12.1		$ 6.5	$ 5.6				12.1
Stock-based compensation and exercise of awards (in shares)				500,000.0
Ending Balance at Dec. 31, 2014	$ 777.2	776.3	$ 1.2	$ (597.7)	1,155.4	259.7	(42.3)	0.9	777.2
Ending Balance, Treasury shares (in shares) at Dec. 31, 2014	(32,900,000)			(32,900,000.0)
Ending Balance, Common shares (in shares) at Dec. 31, 2014			122,200,000.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 144.7	144.6				144.6		0.1	144.7
Other comprehensive loss		(29.0)					(29.0)		(29.0)
Cash dividends declared		(37.2)				(37.2)			(37.2)
Repurchase of common shares		(156.1)		$ (156.1)					(156.1)
Repurchase of common shares (in shares)				(4,500,000.0)
Stock-based compensation and exercise of awards		5.6		$ 5.4	0.2				5.6
Stock-based compensation and exercise of awards (in shares)				500,000.0
Ending Balance at Dec. 31, 2015	$ 705.2	$ 704.2	$ 1.2	$ (748.4)	$ 1,155.6	$ 367.1	$ (71.3)	$ 1.0	$ 705.2
Ending Balance, Treasury shares (in shares) at Dec. 31, 2015	(36,900,000)			(36,900,000.0)
Ending Balance, Common shares (in shares) at Dec. 31, 2015			122,200,000.0