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Business Acquisition Acquired Intangible Assets (Details) - Dec. 31, 2014 - Pronamic And SNN [Member] - USD ($) $ in Millions	Total
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 11.6
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years
Customer relationships [Member]
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 6.1
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years
Developed Technology [Member]
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 2.1
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	20 years
Patents [Member]
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 1.5
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	17 years
Customer Contracts [Member]
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 1.9
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	6 years

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- Definition

[Line Items] for Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Table]

+ References

No definition available.

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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 30



-Section 50



-Paragraph 1



-Subparagraph (a)(3)



-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275

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- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 805



-SubTopic 20



-Section 50



-Paragraph 1



-Subparagraph (c)



-URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472

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