Joint Ventures (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended	9 Months Ended
Oct. 31, 2011	Sep. 30, 2011	Sep. 30, 2011
Equity Method Investment Description Of Principal Activities			VCE, through Vblock infrastructure platforms, delivers an integrated IT offering that combines network, computing, storage, management, security and virtualization technologies for converged infrastructures and cloud based computing models.
Accumulated capital contribution			$ 242.9
Capital contribution	94.7
Stock-based compensation contributed to joint venture			10.0
Consolidated ownership perentage of outstanding equity		58.00%	58.00%
Net Accumulated Loss from Equity Method Investments			182.5
Income Loss From Equity Method Investments		50.2	138.7
Receivable from joint venture		$ 67.2	$ 67.2

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This item represents the entity's proportionate share for the net accumulated income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Represents accumulated monetary amount of stock-based compensation contributed to joint venture investment

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Amounts due from an entity in which the reporting entity shares joint control with another party or group, due within 1 year (or 1 business cycle).

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A description of the principal activities of an investee accounted for under the equity method.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. Such amount typically reflects adjustments similar to those made in preparing consolidated statements, including adjustments to eliminate intercompany gains and losses, and to amortize, if appropriate, any difference between cost and underlying equity in net assets of the investee at the date of investment.

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The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

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