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Fair Value Measurements (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Venture Capital Investments [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Venture Capital Investments [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Venture Capital Investments [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Venture Capital Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period			$ 18.0	$ 20.3	$ 22.1	$ 23.5
Unrealized gains included in earnings	0.6	0.4
Unrealized losses included in earnings	(1.4)	(1.8)
Settlements	(1.5)	0
Fair value, end of period			$ 18.0	$ 20.3	$ 22.1	$ 23.5

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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