Segment Information (Narrative) (Details) $ in Millions			12 Months Ended
	Dec. 09, 2015 USD ($)	Dec. 01, 2014 USD ($)	Dec. 31, 2015 USD ($) segment supplier grade_resin injection_molder_extruder	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Segment Reporting Information [Line Items]
Restructuring related cost, accelerated depreciation			$ 6.2	$ 23.1	$ 12.7
Total consideration transferred to debt and equity holders, net of cash acquired			$ 18.3	$ 47.2	$ 259.4
Number of reportable segments | segment			5
Number Of Grades of Resins Sold by PolyOne Distribution | grade_resin			3,500
Number of products sold | injection_molder_extruder			6,000
Number Of Suppliers Represented by PolyOne Distribution | supplier			25
Accella
Segment Reporting Information [Line Items]
Total consideration transferred to debt and equity holders, net of cash acquired		$ 47.2
Magenta
Segment Reporting Information [Line Items]
Total consideration transferred to debt and equity holders, net of cash acquired	$ 18.3