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Non-Marketable Investments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2008	Dec. 31, 2007
Non-Marketable Investments (Textual) [Abstract]
Gain (losses) from non-marketable investments	$ (0.1)	$ (0.4)
Non-Marketable Investments (Additional Textual) [Abstract]
Book value of investment	1.2		1.2	1.5
Gross distributions received from funds			0.5	0.5	0.5
Accrued amount under cash bonus plan	0		0
Income from equity method investment understated amount						0.2	0.4
Income from equity method investment overstated amount				1.4
Reduction in income from equity method investment	0.2	0.6
Bonus paid under cash bonus plan			0
Cash bonus plan expiration date			Jun. 30, 2013
Maximum [Member]
Non-Marketable Investments (Textual) [Abstract]
Participant in the cash bonus plan			10
Minimum [Member]
Non-Marketable Investments (Textual) [Abstract]
Ownership interest of company	5.00%		5.00%
Technology Related Private Equity Funds [Member]
Non-Marketable Investments (Textual) [Abstract]
Carrying Value of the Company's non-marketable investments	6.9		6.9	7.9
Non Marketable Investments [Member]
Non-Marketable Investments (Textual) [Abstract]
Gain (losses) from non-marketable investments			$ (0.4)	$ 1.0	$ 2.3

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Other investment not readily marketable.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 159

-Paragraph 18

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Principles Board Opinion (APB)

-Number 18

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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