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Carrying Amount and Fair Value of Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Assets |  |
Mortgage Loans | $ 1,730.4 | $ 1,712.7
Policy Loans | 3,141.4 | 3,133.8
Other Long Term Investments |  |
Derivatives | 62.1 | 81.6
Equity Securities | 14.4 | 14.6
Policyholders' Funds |  |
Long-term Debt | 2,673.9 | 2,755.4
Other Liabilities |  |
Derivatives | 234.9 | 254.4
Unfunded commitment to fund Investment Partnerships | 75.7 |
Carrying Amount |  |
Assets |  |
Fixed Maturity Securities | 44,436.5 | 44,973.0
Mortgage Loans | 1,730.4 | 1,712.7
Policy Loans | 3,141.4 | 3,133.8
Other Long Term Investments |  |
Derivatives | 62.1 | 81.6
Equity Securities | 14.4 | 14.6
Miscellaneous Long-Term Investments | 438.4 | 455.1
Policyholders' Funds |  |
Deferred Annuity Products | 637.5 | 640.1
Supplementary Contracts without Life Contingencies | 548.3 | 535.5
Long-term Debt | 2,673.9 | 2,755.4
Other Liabilities |  |
Derivatives | 157.4 | 170.5
Embedded Derivative in Modified Coinsurance Arrangement | 77.5 | 83.9
Unfunded commitment to fund Investment Partnerships | 75.7 | 83.7
Fair Value |  |
Assets |  |
Fixed Maturity Securities | 44,436.5 | 44,973.0
Mortgage Loans | 1,959.8 | 1,937.1
Policy Loans | 3,219.7 | 3,215.3
Other Long Term Investments |  |
Derivatives | 62.1 | 81.6
Equity Securities | 14.4 | 14.6
Miscellaneous Long-Term Investments | 438.4 | 455.1
Policyholders' Funds |  |
Deferred Annuity Products | 637.5 | 640.1
Supplementary Contracts without Life Contingencies | 548.3 | 535.5
Long-term Debt | 2,954.9 | 2,968.8
Other Liabilities |  |
Derivatives | 157.4 | 170.5
Embedded Derivative in Modified Coinsurance Arrangement | 77.5 | 83.9
Unfunded commitment to fund Investment Partnerships | $ 75.7 | $ 83.7

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