Goodwill And Intangible Assets (Goodwill By Operating Segment) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Roll Forward]
Goodwill, gross at beginning of period			$ 762.3
Accumulated impairment losses			(203.3)
Balance, beginning of period	$ 590.6	$ 559.0
Acquisitions of businesses	8.6	32.1
Goodwill, Translation and Purchase Accounting Adjustments	(1.5)	(0.5)
Balance, end of period	597.7	590.6	559.0
Specialty Engineered Materials
Goodwill [Roll Forward]
Goodwill, gross at beginning of period			112.1
Accumulated impairment losses			(12.2)
Balance, beginning of period	99.4	99.9
Acquisitions of businesses	0.0	0.0
Goodwill, Translation and Purchase Accounting Adjustments	(1.4)	(0.5)
Balance, end of period	98.0	99.4	99.9
Color, Additives and Inks
Goodwill [Roll Forward]
Goodwill, gross at beginning of period			326.3
Accumulated impairment losses			(16.1)
Balance, beginning of period	333.7	310.2
Acquisitions of businesses	8.6	23.5
Goodwill, Translation and Purchase Accounting Adjustments	(0.1)	0.0
Balance, end of period	342.2	333.7	310.2
Designed Structures and Solutions
Goodwill [Roll Forward]
Goodwill, gross at beginning of period			136.3
Accumulated impairment losses			0.0
Balance, beginning of period	144.7	136.3
Acquisitions of businesses	0.0	8.4
Goodwill, Translation and Purchase Accounting Adjustments	0.0	0.0
Balance, end of period	144.7	144.7	136.3
Performance Products and Solutions
Goodwill [Roll Forward]
Goodwill, gross at beginning of period			186.0
Accumulated impairment losses			(175.0)
Balance, beginning of period	11.2	11.0
Acquisitions of businesses	0.0	0.2
Goodwill, Translation and Purchase Accounting Adjustments	0.0	0.0
Balance, end of period	11.2	11.2	11.0
PolyOne Distribution
Goodwill [Roll Forward]
Goodwill, gross at beginning of period			1.6
Accumulated impairment losses			0.0
Balance, beginning of period	1.6	1.6
Acquisitions of businesses	0.0	0.0
Goodwill, Translation and Purchase Accounting Adjustments	0.0	0.0
Balance, end of period	$ 1.6	$ 1.6	$ 1.6

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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