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Fair Value Measurements by Input Level (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Fixed Maturity Securities |  |
Fixed Maturity Securities | $ 42,486.7 | $ 40,035.6
Other Long-term Investments |  |
Derivative Assets | 137.7 | 99.1
Equity Securities | 11.2 | 10.4
Other Liabilities |  |
Derivative Liabilities | 309.4 | 295.9
Interest Rate Swap [Member] |  |
Other Long-term Investments |  |
Derivative Assets | 134.2 | 98.4
Other Liabilities |  |
Derivative Liabilities | 32.9 | 39.1
Foreign Exchange Contracts |  |
Other Long-term Investments |  |
Derivative Assets | 3.5 | 0.7
Other Liabilities |  |
Derivative Liabilities | 140.8 | 160.5
Embedded Derivative in Modified Coinsurance Arrangement |  |
Other Liabilities |  |
Derivative Liabilities | 135.7 | 96.3
United States Government and Government Agencies and Authorities |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 1,304.4 | 1,101.7
States, Municipalities, and Political Subdivisions |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 1,591.6 | 1,245.2
Foreign Governments |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 1,376.7 | 1,409.3
Public Utilities |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 10,633.3 | 9,684.2
Mortgage/Asset-backed Securities |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 2,973.2 | 3,385.5
All Other Corporate Bonds |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 24,550.1 | 23,154.7
Redeemable Preferred Stocks |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 57.4 | 55.0
Fair Value, Inputs, Level 1 [Member] |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 4,621.4 | 5,416.2
Other Long-term Investments |  |
Derivative Assets | 0 | 0
Equity Securities | 0 | 0
Other Liabilities |  |
Derivative Liabilities | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member] |  |
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] | 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 | 326.6 | 102.8
Fair Value, Inputs, Level 1 [Member] | States, Municipalities, and Political Subdivisions |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 107.3 | 301.9
Fair Value, Inputs, Level 1 [Member] | Foreign Governments |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 0 | 0.7
Fair Value, Inputs, Level 1 [Member] | Public Utilities |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 718.0 | 840.1
Fair Value, Inputs, Level 1 [Member] | Mortgage/Asset-backed Securities |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 0 | 0
Fair Value, Inputs, Level 1 [Member] | All Other Corporate Bonds |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 3,469.5 | 4,170.7
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 | 36,723.9 | 33,593.7
Other Long-term Investments |  |
Derivative Assets | 137.7 | 99.1
Equity Securities | 0 | 8.9
Other Liabilities |  |
Derivative Liabilities | 173.7 | 199.6
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |
Other Long-term Investments |  |
Derivative Assets | 134.2 | 98.4
Other Liabilities |  |
Derivative Liabilities | 32.9 | 39.1
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contracts |  |
Other Long-term Investments |  |
Derivative Assets | 3.5 | 0.7
Other Liabilities |  |
Derivative Liabilities | 140.8 | 160.5
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 | 977.8 | 998.9
Fair Value, Inputs, Level 2 [Member] | States, Municipalities, and Political Subdivisions |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 1,416.2 | 943.3
Fair Value, Inputs, Level 2 [Member] | Foreign Governments |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 1,376.7 | 1,408.6
Fair Value, Inputs, Level 2 [Member] | Public Utilities |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 9,576.4 | 8,670.5
Fair Value, Inputs, Level 2 [Member] | Mortgage/Asset-backed Securities |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 2,941.5 | 3,384.8
Fair Value, Inputs, Level 2 [Member] | All Other Corporate Bonds |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 20,415.1 | 18,154.3
Fair Value, Inputs, Level 2 [Member] | Redeemable Preferred Stocks |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 20.2 | 33.3
Fair Value, Inputs, Level 3 [Member] |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 1,141.4 | 1,025.7
Other Long-term Investments |  |
Derivative Assets | 0 | 0
Equity Securities | 11.2 | 1.5
Other Liabilities |  |
Derivative Liabilities | 135.7 | 96.3
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member] |  |
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] | Embedded Derivative in Modified Coinsurance Arrangement |  |
Other Liabilities |  |
Derivative Liabilities | 135.7 | 96.3
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 | 68.1 | 0
Fair Value, Inputs, Level 3 [Member] | Foreign Governments |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Public Utilities |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 338.9 | 173.6
Fair Value, Inputs, Level 3 [Member] | Mortgage/Asset-backed Securities |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 31.7 | 0.7
Fair Value, Inputs, Level 3 [Member] | All Other Corporate Bonds |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | 665.5 | 829.7
Fair Value, Inputs, Level 3 [Member] | Redeemable Preferred Stocks |  |
Fixed Maturity Securities |  |
Fixed Maturity Securities | $ 37.2 | $ 21.7

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