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Description of Business and Basis of Presentation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Description of Business and Basis of Presentation
Number of reportable segments			2
Amortization of certain technology-related intangible assets	$ 3.5	$ 0.4	$ 6.8	$ 0.6
Period for which products are warranted to be free from defect (in years)			1
Number of years past due for deferring revenue when collectability is not reasonably assured (in years)			1
ASC 2009-13
Recent Accounting Pronouncements
Number of significant changes to the existing guidance for multiple element arrangements			3

The amount of expense recognized in the current period that reflects the allocation of capitalized costs associated with acquisition of business. 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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