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Research and development in process, number of projects

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

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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 in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, resulting from a business combination.

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No definition available.

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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The amount of purchased research and development assets that are acquired in a business combination have no alternative future use and are therefore written off in the period of acquisition.

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-Publisher FASB

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Goodwill And Intangible Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 13, 2014	Dec. 19, 2012
Goodwill and Intangible Assets [Line Items]
Goodwill	$ 590.6us-gaap_Goodwill	$ 559.0us-gaap_Goodwill	$ 405.5us-gaap_Goodwill
Indefinite-lived other intangible assets	99.7
Number of R&D in process projects	1
Amortization of other finite-lived intangible assets	19.2us-gaap_AmortizationOfIntangibleAssets	17.8us-gaap_AmortizationOfIntangibleAssets	13.2us-gaap_AmortizationOfIntangibleAssets
Spartech Corporation [Member]
Goodwill and Intangible Assets [Line Items]
Goodwill				162.6
Glasforms, Inc.
Goodwill and Intangible Assets [Line Items]
Goodwill					12.4
ColorMatrix
Goodwill and Intangible Assets [Line Items]
Trade names acquired	63.1
In-process R&D acquired	3.4
GLS Corporation
Goodwill and Intangible Assets [Line Items]
Trade names acquired	$ 33.2