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Unaudited Quarterly Results (Tables) | 12 Months Ended
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Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] | The following is a summary of our unaudited quarterly results of operations for 2011 and 2010:
| 2011
| 4 th |  | 3 rd |  | 2 nd |  | 1 st
| (in millions of dollars, except share data)
Premium Income | $ | 1,888.5 |  |  | $ | 1,881.2 |  |  | $ | 1,875.0 |  |  | $ | 1,869.5 |
Net Investment Income | 634.6 |  |  | 629.2 |  |  | 637.1 |  |  | 618.7 |
Net Realized Investment Gain (Loss) | 7.4 |  |  | (23.9 | ) |  | (3.6 | ) |  | 15.2 |
Total Revenue | 2,604.8 |  |  | 2,545.6 |  |  | 2,564.5 |  |  | 2,563.1 |
Income (Loss) Before Income Tax | (704.3 | ) |  | 293.3 |  |  | 338.0 |  |  | 330.2 |
Net Income (Loss) | (425.4 | ) |  | 205.6 |  |  | 229.8 |  |  | 225.4 |
Net Income (Loss) Per Common Share |  |  |  |  |  |  |
Basic | (1.45 | ) |  | 0.69 |  |  | 0.75 |  |  | 0.72 |
Assuming Dilution | (1.45 | ) |  | 0.69 |  |  | 0.75 |  |  | 0.72 |
| 2010
| 4 th |  | 3 rd |  | 2 nd |  | 1 st
| (in millions of dollars, except share data)
Premium Income | $ | 1,868.2 |  |  | $ | 1,850.2 |  |  | $ | 1,849.8 |  |  | $ | 1,863.2 |
Net Investment Income | 634.3 |  |  | 618.4 |  |  | 629.8 |  |  | 613.0 |
Net Realized Investment Gain (Loss) | 27.5 |  |  | 1.1 |  |  | (29.5 | ) |  | 25.6 |
Total Revenue | 2,593.1 |  |  | 2,527.9 |  |  | 2,510.6 |  |  | 2,561.6 |
Income Before Income Tax | 335.5 |  |  | 326.5 |  |  | 308.1 |  |  | 361.2 |
Net Income | 225.8 |  |  | 220.8 |  |  | 209.7 |  |  | 229.8 |
Net Income Per Common Share |  |  |  |  |  |  |
Basic | 0.71 |  |  | 0.68 |  |  | 0.63 |  |  | 0.69 |
Assuming Dilution | 0.71 |  |  | 0.68 |  |  | 0.63 |  |  | 0.69 |

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 270 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (a)-(j) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6952194&loc=d3e1280-108306 + Details
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