Goodwill And Intangible Assets (Goodwill By Operating Segment) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Roll Forward]
Goodwill, gross at January 1, 2013			$ 608.8us-gaap_GoodwillGross
Accumulated impairment losses			(203.3)us-gaap_GoodwillImpairmentLoss
Balance, beginning of period	559.0us-gaap_Goodwill	405.5us-gaap_Goodwill
Acquisitions of businesses	32.1us-gaap_GoodwillAcquiredDuringPeriod	154.1us-gaap_GoodwillAcquiredDuringPeriod
Balance, end of period	590.6us-gaap_Goodwill	559.0us-gaap_Goodwill	405.5us-gaap_Goodwill
Currency translation	(0.5)	(0.6)
Global Specialty Engineered Materials
Goodwill [Roll Forward]
Goodwill, gross at January 1, 2013			110.8
Accumulated impairment losses			(12.2)
Balance, beginning of period	99.9	98.6
Acquisitions of businesses	0	1.8
Balance, end of period	99.4	99.9	98.6
Currency translation	(0.5)	(0.5)
Global Color, Additives and Inks
Goodwill [Roll Forward]
Goodwill, gross at January 1, 2013			314.0
Accumulated impairment losses			(16.1)
Balance, beginning of period	310.2	297.9
Acquisitions of businesses	23.5	12.4
Balance, end of period	333.7	310.2	297.9
Currency translation	0	(0.1)
Designed Structures and Solutions [Member]
Goodwill [Roll Forward]
Goodwill, gross at January 1, 2013			0
Accumulated impairment losses			0
Balance, beginning of period	136.3	0
Acquisitions of businesses	8.4	136.3
Balance, end of period	144.7	136.3	0
Currency translation	0	0
Performance Products and Solutions
Goodwill [Roll Forward]
Goodwill, gross at January 1, 2013			182.4
Accumulated impairment losses			(175.0)
Balance, beginning of period	11.0	7.4
Acquisitions of businesses	0.2	3.6
Balance, end of period	11.2	11.0	7.4
Currency translation	0	0
PolyOne Distribution
Goodwill [Roll Forward]
Goodwill, gross at January 1, 2013			1.6
Accumulated impairment losses			0
Balance, beginning of period	1.6	1.6
Acquisitions of businesses	0	0
Balance, end of period	1.6	1.6	1.6
Currency translation	$ 0	$ 0

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 loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Current period translation adjustment resulting from translating foreign currency financial statements into the reporting currency. Adjustment is not included in determining net income, but is reported in other comprehensive income.

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