Financial Instruments Financial Instruments (Details Textual 2) (Strategic Investments, USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Strategic Investments
Business Acquisition [Line Items]
Strategic investment portfolio	$ 51.1		$ 51.1		$ 56.9
Venture capital investments	21.5		21.5		33.1
Cost basis of equity securities of certain privately-owned companies and venture capital funds	29.6		29.6		23.8
Net gains (losses) realized	$ 2.0	$ 4.4	$ 4.9	$ 4.1