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Reinsurance (Tables) | 12 Months Ended
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Dec. 31, 2011
Reinsurance Disclosures [Abstract] |
Reinsurance Premiums for Insurance Companies by Product Segment Table [Text Block] | Reinsurance data is as follows:
| Year Ended December 31
| 2011 |  | 2010 |  | 2009
| (in millions of dollars)
Direct Premium Income | $ | 7,521.5 |  |  | $ | 7,434.3 |  |  | $ | 7,494.7 |
Reinsurance Assumed | 216.6 |  |  | 241.3 |  |  | 239.5 |
Reinsurance Ceded | (223.9 | ) |  | (244.2 | ) |  | (258.7 | )
Net Premium Income | $ | 7,514.2 |  |  | $ | 7,431.4 |  |  | $ | 7,475.5 |
Ceded Benefits and Change in Reserves for Future Benefits | $ | 609.2 |  |  | $ | 602.2 |  |  | $ | 604.2 |

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