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Schedule I Summary of Investments (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
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Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | $ 36,640.7 | [1] | $ 36,546.6
Fixed Maturity Securities | 42,486.7 |  | 40,035.6
Mortgage Loans | 1,612.3 | [1] | 1,516.8
Policy Loans | 3,051.4 |  | 2,996.1
Other Long-term Investments |  |  |
Derivative Assets | 137.7 |  | 99.1
Available-for-sale Equity Securities, Amortized Cost Basis | 11.1 |  |
Equity Securities | 11.2 |  | 10.4
Other Investments and Securities, at Cost | 482.1 |  |
Other Long-term Investments | 639.2 |  | 529.3
Short-term Investments | 1,423.5 |  |
Investment Owned, at Cost | 43,221.1 |  |
Investments | 49,213.1 |  | 46,240.9
US Government and Government Agencies and Authorities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 1,005.8 | [1] | 981.7
Fixed Maturity Securities | 1,304.4 |  | 1,101.7
US States and Political Subdivisions Debt Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 1,377.8 | [1] | 1,271.0
Fixed Maturity Securities | 1,591.6 |  | 1,245.2
Foreign Government Debt Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 1,139.4 | [1] | 1,248.6
Fixed Maturity Securities | 1,376.7 |  | 1,409.3
Public Utility, Bonds [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 9,015.7 | [1] | 8,874.2
Fixed Maturity Securities | 10,633.3 |  | 9,684.2
Asset-backed Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 2,634.6 | [1] | 3,047.8
Fixed Maturity Securities | 2,973.2 |  | 3,385.5
All Other Corporate Bonds [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 21,411.6 | [1] | 21,067.5
Fixed Maturity Securities | 24,550.1 |  | 23,154.7
Redeemable Preferred Stock [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 55.8 | [1] | 55.8
Fixed Maturity Securities | 57.4 |  | 55.0
Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Fixed Maturity Securities | 42,486.7 |  |
Mortgage Loans | 1,612.3 |  | 1,516.8
Policy Loans | 3,051.4 |  | 2,996.1
Other Long-term Investments |  |  |
Derivative Assets | 137.7 | [2] | 99.1
Equity Securities | 11.2 |  | 10.4
Other Long-term Investments | 490.3 | [3] | 419.8
Short-term Investments | 1,423.5 |  |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | US Government and Government Agencies and Authorities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Fixed Maturity Securities | 1,304.4 |  |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Fixed Maturity Securities | 1,591.6 |  |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Foreign Government Debt Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Fixed Maturity Securities | 1,376.7 |  |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Public Utility, Bonds [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Fixed Maturity Securities | 10,633.3 |  |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Asset-backed Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Fixed Maturity Securities | 2,973.2 |  |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | All Other Corporate Bonds [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Fixed Maturity Securities | 24,550.1 |  |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Redeemable Preferred Stock [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Fixed Maturity Securities | $ 57.4 |  |
[1] | Amortized cost for fixed maturity securities and mortgage loans represents original cost reduced by repayments, write-downs from other-than-temporary declines in fair value, amortization of premiums, and accretion of discounts.
[2] | Derivatives are carried at fair value.
[3] | Difference between cost and carrying value primarily results from changes in our ownership equity since acquisition.

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- Definition This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Gross amount of loans made to policy and contract holders using their life insurance contracts' cash value or separate accounts as collateral. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(e)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-LHI -Chapter 11 -Paragraph 104, 105, 106 -IssueDate 2006-05-01 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 1 -Subparagraph e Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)(7)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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