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Income Taxes (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Income Tax Update |  |  |
Impact on overall effective tax rate | (109.00%) | 72.00% | 38.00%
Equity Investment | $ 200.0 |  |

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