Fair Value Measurements (Details Textual 1) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Business Acquisition, Contingent Consideration [Line Items]
Percentage Of Venture Capital Investments To Assets	0.20%	0.20%
Other Liabilities Non Current [Member]
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration obligations	272.0	271.5

Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

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+ Details