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Fair Value Measurements by Input Level (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Fixed Maturity Securities |  |
Fixed Maturity Securities | $ 44,436.5 | $ 44,973.0
Other Long-term Investments |  |
Derivative Assets | 62.1 | 81.6
Equity Securities |  |
Equity Securities | 14.4 | 14.6
Other Liabilities |  |
Derivative Liabilities | 234.9 | 254.4
Interest Rate Swaps |  |
Other Long-term Investments |  |
Derivative Assets | 59.6 | 76.5
Other Liabilities |  |
Derivative Liabilities | 31.2 | 31.7
Foreign Exchange Contracts |  |
Other Long-term Investments |  |
Derivative Assets | 2.5 | 5.1
Other Liabilities |  |
Derivative Liabilities | 125.5 | 138.8
Credit Default Swaps |  |
Other Liabilities |  |
Derivative Liabilities | 0.7 |
Embedded Derivative in Modified Coinsurance Arrangement |  |
Other Liabilities |  |
Derivative Liabilities | 77.5 | 83.9
United States Government and Government Agencies and Authorities |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 1,335.1 | 1,348.8
States, Municipalities, and Political Subdivisions |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 1,853.8 | 1,806.8
Foreign Governments |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 1,457.8 | 1,507.0
Public Utilities |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 11,089.2 | 11,144.2
Mortgage/Asset-backed Securities |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 2,042.2 | 2,216.5
All Other Corporate Bonds |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 26,619.1 | 26,910.4
Redeemable Preferred Stocks |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 39.3 | 39.3
Fair Value, Inputs, Level 1 [Member] |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 4,237.3 | 2,218.4
Other Long-term Investments |  |
Derivative Assets | 0 | 0
Equity Securities |  |
Equity Securities | 0 | 0
Other Liabilities |  |
Derivative Liabilities | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swaps |  |
Other Long-term Investments |  |
Derivative Assets | 0 | 0
Other Liabilities |  |
Derivative Liabilities | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Contracts |  |
Other Long-term Investments |  |
Derivative Assets | 0 | 0
Other Liabilities |  |
Derivative Liabilities | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Credit Default Swaps |  |
Other Liabilities |  |
Derivative Liabilities | 0 |
Fair Value, Inputs, Level 1 [Member] | Embedded Derivative in Modified Coinsurance Arrangement |  |
Other Liabilities |  |
Derivative Liabilities | 0 | 0
Fair Value, Inputs, Level 1 [Member] | United States Government and Government Agencies and Authorities |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 359.5 | 104.1
Fair Value, Inputs, Level 1 [Member] | States, Municipalities, and Political Subdivisions |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 33.5 | 53.0
Fair Value, Inputs, Level 1 [Member] | Foreign Governments |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Public Utilities |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 596.3 | 84.2
Fair Value, Inputs, Level 1 [Member] | Mortgage/Asset-backed Securities |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 15.5 | 0
Fair Value, Inputs, Level 1 [Member] | All Other Corporate Bonds |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 3,232.5 | 1,977.1
Fair Value, Inputs, Level 1 [Member] | Redeemable Preferred Stocks |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 38,521.7 | 40,766.3
Other Long-term Investments |  |
Derivative Assets | 62.1 | 81.6
Equity Securities |  |
Equity Securities | 10.1 | 10.3
Other Liabilities |  |
Derivative Liabilities | 157.4 | 170.5
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swaps |  |
Other Long-term Investments |  |
Derivative Assets | 59.6 | 76.5
Other Liabilities |  |
Derivative Liabilities | 31.2 | 31.7
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contracts |  |
Other Long-term Investments |  |
Derivative Assets | 2.5 | 5.1
Other Liabilities |  |
Derivative Liabilities | 125.5 | 138.8
Fair Value, Inputs, Level 2 [Member] | Credit Default Swaps |  |
Other Liabilities |  |
Derivative Liabilities | 0.7 |
Fair Value, Inputs, Level 2 [Member] | Embedded Derivative in Modified Coinsurance Arrangement |  |
Other Liabilities |  |
Derivative Liabilities | 0 | 0
Fair Value, Inputs, Level 2 [Member] | United States Government and Government Agencies and Authorities |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 975.6 | 1,244.7
Fair Value, Inputs, Level 2 [Member] | States, Municipalities, and Political Subdivisions |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 1,645.5 | 1,625.1
Fair Value, Inputs, Level 2 [Member] | Foreign Governments |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 1,375.2 | 1,424.9
Fair Value, Inputs, Level 2 [Member] | Public Utilities |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 10,090.4 | 10,485.6
Fair Value, Inputs, Level 2 [Member] | Mortgage/Asset-backed Securities |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 2,026.2 | 2,216.0
Fair Value, Inputs, Level 2 [Member] | All Other Corporate Bonds |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 22,394.3 | 23,755.5
Fair Value, Inputs, Level 2 [Member] | Redeemable Preferred Stocks |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 14.5 | 14.5
Fair Value, Inputs, Level 3 [Member] |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 1,677.5 | 1,988.3
Other Long-term Investments |  |
Derivative Assets | 0 | 0
Equity Securities |  |
Equity Securities | 4.3 | 4.3
Other Liabilities |  |
Derivative Liabilities | 77.5 | 83.9
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swaps |  |
Other Long-term Investments |  |
Derivative Assets | 0 | 0
Other Liabilities |  |
Derivative Liabilities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Contracts |  |
Other Long-term Investments |  |
Derivative Assets | 0 | 0
Other Liabilities |  |
Derivative Liabilities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Credit Default Swaps |  |
Other Liabilities |  |
Derivative Liabilities | 0 |
Fair Value, Inputs, Level 3 [Member] | Embedded Derivative in Modified Coinsurance Arrangement |  |
Other Liabilities |  |
Derivative Liabilities | 77.5 | 83.9
Fair Value, Inputs, Level 3 [Member] | United States Government and Government Agencies and Authorities |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | States, Municipalities, and Political Subdivisions |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 174.8 | 128.7
Fair Value, Inputs, Level 3 [Member] | Foreign Governments |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 82.6 | 82.1
Fair Value, Inputs, Level 3 [Member] | Public Utilities |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 402.5 | 574.4
Fair Value, Inputs, Level 3 [Member] | Mortgage/Asset-backed Securities |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 0.5 | 0.5
Fair Value, Inputs, Level 3 [Member] | All Other Corporate Bonds |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 992.3 | 1,177.8
Fair Value, Inputs, Level 3 [Member] | Redeemable Preferred Stocks |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | $ 24.8 | $ 24.8

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