Subsequent Event (Details) (Subsequent Event [Member], One Lambda [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Jul. 16, 2012
Subsequent Event [Member] \| One Lambda [Member]
Subsequent Event [Line Items]
Total Purchase Price		$ 866.0
Future Business Acquisition, Cost of Acquired Entity, Estimated Cash Payment		925.0
Revenue Reported by Acquired Entity	$ 182.0

The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant