Fair Value Measurements (Details Textual 1) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012
Business Acquisition, Contingent Consideration [Line Items]
Impairment of Long-Lived Assets Held-for-use	$ 0	$ 0
Fair Value Measurements, Changes in Valuation Techniques	0	0
Percentage Of Venture Capital Investments To Assets	0.20%	0.20%	0.20%
Other Liabilities Non Current [Member]
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration obligations	$ 251.9	$ 251.9	$ 271.5