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Equity Dividends Paid (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Stockholders' Equity Attributable to Parent [Abstract] |  |  |  |
Payments of Dividends | $ 90.7 | $ 7.1 | $ 7.3 | $ 7.3

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