Additional Acquisitions (Textuals) [Abstract].

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Business Acquisition Deferred Consideration At Fair Value.

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Contingent consideration paid with cash and equity.

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Contingent consideration paid with equity.

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Contingent consideration stock issued.

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Deferred stock consideration shares.

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Amount of cash paid to acquire the entity.

+ References

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-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 51
-Subparagraph d
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- Definition

Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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Month, day and year when the business acquisition agreement was executed.

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Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity.

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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-Name Emerging Issues Task Force (EITF)
-Number 99-12
-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.

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Number of shares of equity interests issued or issuable to acquire entity.

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Percentage of voting equity interests acquired in the business combination.

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-Paragraph 68
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-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.

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-Name Accounting Standards Codification
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-Paragraph 2
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This element represents the acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer.

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- Definition

Purchase accounting adjustments needed to revise the carrying amount of goodwill to fair value.

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The net cash inflow or outflow associated with the aggregate amount of adjustment to the purchase price of a previous acquisition.

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Acquisitions (Details 1) In Millions, except Share data, unless otherwise specified			1 Months Ended	3 Months Ended			12 Months Ended
	Jul. 31, 2011 EUR (€)	Jun. 30, 2011 USD ($)	Aug. 31, 2008 Derivatives Consulting Group Limited [Member]	Jun. 30, 2011 Derivatives Consulting Group Limited [Member] USD ($)	Mar. 31, 2011 Derivatives Consulting Group Limited [Member] USD ($)	Jun. 30, 2010 Derivatives Consulting Group Limited [Member] USD ($)	Dec. 31, 2009 Derivatives Consulting Group Limited [Member] USD ($)	Feb. 28, 2010 Derivatives Consulting Group Limited [Member] USD ($)	Aug. 06, 2008 Derivatives Consulting Group Limited [Member] USD ($)
Additional Acquisitions (Textuals) [Abstract]
Date of acquisition			2008-08-06
Acquisition, purchase price, net of cash acquired									$ 31.3
Percentage of outstanding shares acquired									100.00%
Acquisition, cash paid, net of cash acquired	4.2	5.9							21.9
Number of shares issued as consideration in business acquisition			307,892
Deferred stock consideration shares								395,125
Estimated fair value of deferred consideration								4.5
Transaction costs of acquisition								2.6
Contingent consideration paid with cash and equity							5.6
Contingent consideration paid with equity						2.4	2.4
Adjustment to goodwill for contingent consideration					4.9
Value of stock issued as consideration in business acquisition				4.9					2.3
Contingent consideration paid in cash							$ 3.2
Common stock issued for contingent consideration				358,736		235,744