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Business Combinations (Details) (Privately-held company, USD $) In Millions, unless otherwise specified	1 Months Ended
	Apr. 30, 2011	Apr. 04, 2011
Business combination
Cash paid to acquire a privately-held company		$ 28.3
Definite-lived intangibles		16.4
Goodwill	15.1
Core technology
Business combination
Definite-lived intangibles		$ 13.6

- Definition

The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

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