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Certain Balance Sheet Components Accounts Receivable, Net Additional Information (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Accounts Receivable, Net (Line Items]
Number of months current retainage amounts and unbilled receivables are expected to be collected	12 months
Long-term unbilled receivables and Long-Term billed retainage		$ 31.5
Current retainage contract receivables [Member]
Accounts Receivable, Net (Line Items]
Contract Receivable Retainage, Due One Year or Less	19.2	2.5
Unbilled Contracts Receivable	10.6	$ 7.4

Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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