Equity Rollforward (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement, Equity Component [Roll Forward]
Balance at the beginning			$ 976.8
Balance at the beginning			1.7
Balance at the beginning			978.5	631.4
Net Income	32.7	23.0	93.8	219.2
Net Income	0	(0.2)	(0.4)	(0.7)
Net income	32.7	22.8	93.4	218.5
Translation adjustments	(16.0)	7.7	(15.6)	(3.0)
Total comprehensive income	16.7	30.5	77.8	215.5
Total comprehensive income	16.7	30.7	78.2	216.2
Total comprehensive income	0	(0.2)	(0.4)	(0.7)
Cash dividend declared			(22.3)	(16.9)
Issuance of common shares in connection to the Spartech acquisition		253.8		253.8
Repurchase of common shares			(175.0)	(95.7)
Stock incentive plan activity			9.0	8.1
Noncontrolling interest activity				0.4
Balance at the ending	866.7		866.7
Balance at the ending	1.3		1.3
Balance at the ending	868.0	996.6	868.0	996.6
PolyOne Shareholders' Equity [Member]
Statement, Equity Component [Roll Forward]
Balance at the beginning			976.8	629.1
Net Income				219.2
Translation adjustments			(15.6)	(3.0)
Total comprehensive income			78.2	216.2
Cash dividend declared			(22.3)	(16.9)
Issuance of common shares in connection to the Spartech acquisition		253.8		253.8
Repurchase of common shares			(175.0)	(95.7)
Stock incentive plan activity			9.0	8.1
Noncontrolling interest activity				0
Balance at the ending	866.7	994.6	866.7	994.6
Noncontrolling Interests [Member]
Statement, Equity Component [Roll Forward]
Balance at the beginning			1.7	2.3
Net Income			(0.4)	(0.7)
Translation adjustments			0	0
Total comprehensive income			(0.4)	(0.7)
Cash dividend declared			0	0
Issuance of common shares in connection to the Spartech acquisition		0		0
Repurchase of common shares			0	0
Stock incentive plan activity			0	0
Noncontrolling interest activity				0.4
Balance at the ending	$ 1.3	$ 2.0	$ 1.3	$ 2.0