Business Combinations (Identified Intangible Assets) (Details) (Engenio External Storage Systems Business [Member], USD $) In Millions, unless otherwise specified	0 Months Ended
	May 06, 2011
Business Acquisition [Line Items]
Total identified intangible assets, Fair Value	$ 272.1
Developed Technology [Member]
Business Acquisition [Line Items]
Fair Value	216.0
Useful Life (Years)	5
Customer Contracts/Relationships [Member]
Business Acquisition [Line Items]
Fair Value	45.0
Useful Life (Years)	2
Trademarks And Trade Names [Member]
Business Acquisition [Line Items]
Fair Value	7.0
Useful Life (Years)	2
Order Backlog [Member]
Business Acquisition [Line Items]
Fair Value	2.5
Useful Life (Years)	0
Noncompete Agreement [Member]
Business Acquisition [Line Items]
Fair Value	$ 1.6
Useful Life (Years)	3