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v2.4.1.9

Parent Company Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Assets [Abstract] |  |  |
Fixed Maturity Securities | $ 45,064.9 us-gaap_AvailableForSaleSecurities | $ 42,344.4 us-gaap_AvailableForSaleSecurities |
Other Long-term Investments | 591.9 us-gaap_OtherLongTermInvestments | 566.0 us-gaap_OtherLongTermInvestments |
Short-term Investments | 974.3 us-gaap_OtherShortTermInvestments | 913.4 us-gaap_OtherShortTermInvestments |
Other Assets | 661.9 us-gaap_OtherAssets | 647.8 us-gaap_OtherAssets |
Total Assets | 62,497.1 us-gaap_Assets | 59,403.6 us-gaap_Assets |
Liabilities |  |  |
Long-term Debt | 2,628.7 us-gaap_LongTermDebtAndCapitalLeaseObligations | 2,612.0 us-gaap_LongTermDebtAndCapitalLeaseObligations |
Other Liabilities | 1,572.6 us-gaap_OtherLiabilities | 1,305.9 us-gaap_OtherLiabilities |
Total Liabilities | 53,944.7 us-gaap_Liabilities | 50,744.5 us-gaap_Liabilities |
Stockholders' Equity |  |  |
Common Stock | 30.2 us-gaap_CommonStockValue | 36.1 us-gaap_CommonStockValue |
Additional Paid-in Capital | 2,221.2 us-gaap_AdditionalPaidInCapitalCommonStock | 2,634.1 us-gaap_AdditionalPaidInCapitalCommonStock |
Accumulated Other Comprehensive Income | 166.4 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 255.0 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 628.0 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Retained Earnings | 7,332.8 us-gaap_RetainedEarningsAccumulatedDeficit | 8,083.2 us-gaap_RetainedEarningsAccumulatedDeficit |
Treasury Stock | (1,198.2)us-gaap_TreasuryStockValue | (2,349.3)us-gaap_TreasuryStockValue |
Total Stockholders' Equity | 8,552.4 us-gaap_StockholdersEquity | 8,659.1 us-gaap_StockholdersEquity | 8,612.6 us-gaap_StockholdersEquity
Total Liabilities and Stockholders' Equity | 62,497.1 us-gaap_LiabilitiesAndStockholdersEquity | 59,403.6 us-gaap_LiabilitiesAndStockholdersEquity |
Parent Company |  |  |
Assets [Abstract] |  |  |
Fixed Maturity Securities | 162.2 us-gaap_AvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 145.3 us-gaap_AvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Other Long-term Investments | 51.9 us-gaap_OtherLongTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 57.2 us-gaap_OtherLongTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Short-term Investments | 326.2 us-gaap_OtherShortTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 164.0 us-gaap_OtherShortTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Investments in Subsidiaries | 10,362.7 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 10,082.8 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Deferred Income Tax | 160.1 us-gaap_DeferredTaxAssetsLiabilitiesNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 68.1 us-gaap_DeferredTaxAssetsLiabilitiesNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Other Assets | 568.3 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 558.8 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Total Assets | 11,631.4 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 11,076.2 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Liabilities |  |  |
Long-term Debt | 2,230.3 us-gaap_LongTermDebtAndCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,875.2 us-gaap_LongTermDebtAndCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Pension and Postretirement Benefits | 581.5 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 295.3 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Other Liabilities | 267.2 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 246.6 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Total Liabilities | 3,079.0 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,417.1 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Stockholders' Equity |  |  |
Common Stock | 30.2 us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 36.1 us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Additional Paid-in Capital | 2,221.2 us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,634.1 us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Accumulated Other Comprehensive Income | 166.4 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 255.0 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Retained Earnings | 7,332.8 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 8,083.2 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Treasury Stock | (1,198.2)us-gaap_TreasuryStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (2,349.3)us-gaap_TreasuryStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Total Stockholders' Equity | 8,552.4 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 8,659.1 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Total Liabilities and Stockholders' Equity | $ 11,631.4 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 11,076.2 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |

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