Financial Instruments Financial Instruments (Details Textual 2) (Strategic Investments, USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | |||
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Dec. 31, 2013
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Strategic Investments
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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 |