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ACCOUNTING FOR DERIVATIVES - FAIR VALUE BY BALANCE SHEET LOCATION (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Interest Rate Contract [Member]    
Derivatives, Fair Value [Line Items]    
Gross amounts recognized $ (0.1)us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 $ (0.2)us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Gross amounts recognized 87.6us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 107.0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Liabilities 1,105.5us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 1,081.5us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Not Designated as Hedging Instrument [Member] | Equity Contract [Member] | Other Invested Assets [Member]    
Derivatives, Fair Value [Line Items]    
Gross amounts recognized 87.7us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= cno_OtherInvestedAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 107.2us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= cno_OtherInvestedAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Invested Assets [Member]    
Derivatives, Fair Value [Line Items]    
Gross amounts recognized (0.1)us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= cno_OtherInvestedAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 (0.2)us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= cno_OtherInvestedAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Not Designated as Hedging Instrument [Member] | Equity Index Annuities - Embedded Derivative [Member] | Future Policy Benefits [Member]    
Derivatives, Fair Value [Line Items]    
Liabilities 1,102.1us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= cno_FuturePolicyBenefitsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= cno_EquityIndexAnnuitiesEmbeddedDerivativeMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 1,081.5us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= cno_FuturePolicyBenefitsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= cno_EquityIndexAnnuitiesEmbeddedDerivativeMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Not Designated as Hedging Instrument [Member] | Reinsurance Payable - Embedded Derivative [Member] | Future Policy Benefits [Member]    
Derivatives, Fair Value [Line Items]    
Liabilities $ 3.4us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= cno_FuturePolicyBenefitsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= cno_ReinsurancePayableEmbeddedDerivativeMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 $ 0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= cno_FuturePolicyBenefitsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= cno_ReinsurancePayableEmbeddedDerivativeMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember