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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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