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Financial Instruments Financial Instruments (Details Textual 2) (Strategic Investments, USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Strategic Investments
         
Business Acquisition [Line Items]          
Strategic investment portfolio $ 47.4   $ 47.4   $ 56.9
Venture capital investments 17.4   17.4   33.1
Cost basis of equity securities of certain privately-owned companies and venture capital funds 30.0   30.0   23.8
Net gains (losses) realized $ 3.1 $ 3.8 $ 1.8 $ 7.9