Segment Information (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			0 Months Ended
	Dec. 31, 2014 grade_resin supplier	Dec. 31, 2013	Dec. 31, 2012	Dec. 01, 2014
Segment Reporting Information [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 47.2	$ 259.4	$ 33.8
Number of products sold	6,000
Number Of Grades of Resins Sold by PolyOne Distribution	3,500
Number Of Suppliers Represented by PolyOne Distribution	25
Accella [Member]
Segment Reporting Information [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired				$ 47.2