Business Combination (Tables)

12 Months Ended

Dec. 31, 2011

Dec. 31, 2010

Business Combinations [Abstract]

Schedule of Purchase Price Allocation [Table Text Block]

Total purchase consideration for these acquisitions at the acquisition dates was allocated as follows (in millions):

Allocation of purchase consideration:	2011 Acquisitions		2010 Acquisitions
Net tangible assets acquired	$	1.7	$	8.8
Intangible assets acquired	28.4		116.5
Goodwill	0.4		269.2
Total	$	30.5	$	394.5

Schedule of Business Acquisitions, by Acquisition [Table Text Block]

Total purchase consideration for these acquisitions is summarized as follows (in millions):

	Ankeena		SMobile		Altor		Trapeze		Total
Net cash	$	66.5	$	69.5	$	104.0	$	152.1	$	392.1
Assumed stock option and RSU awards allocated to purchase price (1)	2.4		—		—		—		2.4
Total	$	68.9	$	69.5	$	104.0	$	152.1	$	394.5

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(1) The fair value of the stock option and RSU awards assumed was based on the acquired company's determined value on the acquisition date.

Schedule of Finite-Lived Intangible Assets by Major Class [Table Text Block]

The following table presents details of the intangible assets acquired through the business combinations completed in 2011, as of December 31, 2011 (in millions, except years):  

	2011 Acquisitions
	Estimated Useful Life (In Years)	Amount
Existing or Core technology	10	$	21.9
Support agreements and related relationships	4	5.1
Patents	5	1.4
Total		$	28.4

The following table presents details of the intangible assets acquired through the business combinations completed during 2010, as of December 31, 2011 (in millions, except years):

	2010 Acquisitions
	Ankeena			SMobile			Altor			Trapeze
	Estimated Useful Life (In Years)	Amount		Estimated Useful Life (In Years)	Amount		Estimated Useful Life (In Years)	Amount		Estimated Useful Life (In Years)	Amount		Total Amount
Existing technology	4.0	$	9.0	5.0	$	24.3	6.0	$	13.9	5.0	$	45.0	$	92.2
In-process research and development	—	—		—	—		—	2.8		—	—		2.8
Core technology	4.0	3.2		—	—		6.0	4.6		—	—		7.8
Customer contracts and related relationships	—	—		6.0	2.1		—	—		7.0	8.6		10.7
Support agreements and related relationships	—	—		6.0	0.1		—	—		7.0	2.6		2.7
Non-compete agreements	—	—		2.0	0.1		—	—		—	—		0.1
OEM customer contracts	—	—		—	—		—	—		2.0	0.2		0.2
Total		$	12.2		$	26.6		$	21.3		$	56.4	$	116.5