Income Taxes (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | Dec. 31, 2010 | |
| Income Taxes (Textuals) [Abstract] | |||||
| Effective tax rate | 36.30% | 36.30% | 36.30% | 36.30% | |
| Effective tax rate, including discontinued operations | 36.40% | 36.40% | 36.40% | 36.40% | |
| Unrecognized tax benefits interest on income taxes expense | $ 63.1 | $ 63.1 | $ 52.9 | ||
| Accrued interest and penalty related to unrecognized tax benefits included in income tax provision | $ 15.5 | $ 15.5 | $ 14.3 | ||