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Schedule I Summary of Investments (Tables) | 12 Months Ended
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Dec. 31, 2011
Schedule I - Summary of Investments [Abstract] |
Investment Holdings, Schedule of Investments [Table Text Block] |
Type of Investment |  | Cost or Amortized Cost (1) |  | Fair Value |  | Amount at which shown in the balance sheet |
|  | (in millions of dollars) |
Fixed Maturity Securities: |  |  |  |  |  |  |
Bonds |  |  |  |  |  |  |
United States Government and Government Agencies and Authorities |  | $ | 1,005.8 |  |  | $ | 1,304.4 |  |  | $ | 1,304.4 |  |
States, Municipalities, and Political Subdivisions |  | 1,377.8 |  |  | 1,591.6 |  |  | 1,591.6 |  |
Foreign Governments |  | 1,139.4 |  |  | 1,376.7 |  |  | 1,376.7 |  |
Public Utilities |  | 9,015.7 |  |  | 10,633.3 |  |  | 10,633.3 |  |
Mortgage/Asset-Backed Securities |  | 2,634.6 |  |  | 2,973.2 |  |  | 2,973.2 |  |
All Other Corporate Bonds |  | 21,411.6 |  |  | 24,550.1 |  |  | 24,550.1 |  |
Redeemable Preferred Stocks |  | 55.8 |  |  | 57.4 |  |  | 57.4 |  |
Total |  | 36,640.7 |  |  | $ | 42,486.7 |  |  | 42,486.7 |  |
Mortgage Loans |  | 1,612.3 |  |  |  |  | 1,612.3 |  |
Policy Loans |  | 3,051.4 |  |  |  |  | 3,051.4 |  |
Other Long-term Investments |  |  |  |  |  |  |
Derivatives |  | — |  |  |  |  | 137.7 |  | (2)
Equity Securities |  | 11.1 |  |  |  |  | 11.2 |  |
Miscellaneous Long-term Investments |  | 482.1 |  |  |  |  | 490.3 |  | (3)
Short-term Investments |  | 1,423.5 |  |  |  |  | 1,423.5 |  |
|  | $ | 43,221.1 |  |  |  |  | $ | 49,213.1 |  |

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- Definition Tabular disclosure of data and information required in the supplementary schedule applicable to management investment companies listing holdings of unaffiliated investments. + References No definition available. + Details
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