Segment Information (Schedule Of Segment Information) (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	Dec. 31, 2013
Segment Reporting Information [Line Items]
Sales to External Customers	$ 958.4	$ 1,008.9	$ 2,966.2	$ 2,847.6
Operating Income	63.6	61.6	169.4	182.8
Total Assets	2,755.8		2,755.8		2,944.1
Global Color Additives And Inks [Member]
Segment Reporting Information [Line Items]
Revenue, Net	207.4	216.4	647.3	648.9
Segment reporting Information, revenue for reportable segment	212.0	219.0	660.3	653.7
Operating Income	30.1	28.9	98.2	84.0
Total Assets	912.6		912.6		962.0
Global Specialty Engineered Materials [Member]
Segment Reporting Information [Line Items]
Revenue, Net	135.3	139.8	428.0	436.2
Segment reporting Information, revenue for reportable segment	145.8	157.6	461.0	469.3
Operating Income	18.4	14.6	55.6	45.4
Total Assets	369.9		369.9		379.6
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue, Net	0	0	0	0
Segment reporting Information, revenue for reportable segment	(45.2)	(37.9)	(128.4)	(106.0)
Operating Income	(34.5)	(24.5)	(126.2)	(61.7)
Total Assets	465.6		465.6		557.7
Designed Structures and Solutions [Member]
Segment Reporting Information [Line Items]
Revenue, Net	152.1	187.8	489.3	428.2
Segment reporting Information, revenue for reportable segment	152.3	187.8	489.9	428.2
Operating Income	13.1	10.9	37.2	21.4
Total Assets	522.5		522.5		549.4
Performance Products And Solutions [Member]
Segment Reporting Information [Line Items]
Revenue, Net	187.2	192.2	560.2	522.6
Segment reporting Information, revenue for reportable segment	213.0	207.4	631.8	584.3
Operating Income	17.8	15.1	51.4	44.0
Total Assets	263.7		263.7		278.7
PolyOne Distribution [Member]
Segment Reporting Information [Line Items]
Revenue, Net	276.4	272.7	841.4	811.7
Segment reporting Information, revenue for reportable segment	280.5	275.0	851.6	818.1
Operating Income	18.7	16.6	53.2	49.7
Total Assets	$ 221.5		$ 221.5		$ 216.7