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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 2) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
item
Dec. 31, 2014
Determination of fair values    
Number of primary sources of information used for determining fair value 1pl_FairValueDeterminationNumberOfSourcesOfInformationConsidered  
Total number of primary sources of information available for determining fair value 3pl_FairValueDeterminationNumberOfSourcesOfInformation  
Minimum percentage of the Company's fixed maturity securities priced by third party pricing services 90.00%pl_FairValueDeterminationPercentageOfFixedMaturitySecuritiesPricedByThirdPartyPricingServicesMinimum  
Number of independent non-binding broker quotes obtained per security 1pl_FairValueDeterminationNumberOfBrokerQuotesObtainedPerSecurity  
Percentage of derivatives excluding embedded derivatives that were priced using exchange prices or independent broker quotations 99.70%pl_PercentageOfDerivativesExcludingEmbeddedDerivativesPricedUsingExchangePricesOrIndependentBrokerQuotations  
Liabilities:    
Fair value $ 674,250,000us-gaap_DerivativeLiabilities  
Annuity account    
Annuity account balances    
Discount rate curve, base rate LIBOR  
Equity indexed annuities, discount rate for one month (as a percent) 0.31%pl_LongDurationContractsAssumptionsByProductAndGuaranteeDiscountRateCurveOneMonth
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
 
Equity indexed annuities, discount rate for five years (as a percent) 2.15%pl_LongDurationContractsAssumptionsByProductAndGuaranteeDiscountRateCurveFiveYear
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
 
Equity indexed annuities, discount rate for thirty years (as a percent) 3.38%pl_LongDurationContractsAssumptionsByProductAndGuaranteeDiscountRateCurveThirtyYear
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
 
Level 3    
Annuity account balances    
Financial instruments that are valued using broker quotes 237,800,000pl_FinancialInstrumentsValuedUsingBrokerQuotesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
 
Financial instruments with book value approximating fair value 66,900,000us-gaap_FinancialInstrumentsOwnedOtherAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
 
Level 3 | Annuity account    
Liabilities:    
Fair value 97,108,000us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
 
Level 3 | Annuity account | Actuarial cash flow model    
Unobservable input    
Expenses per Policy 80pl_FairValueInputsAssetExpenseRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Withdrawal rate (as a percent) 2.20%pl_FairValueInputsAssetWithdrawalRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Level 3 | Annuity account | Actuarial cash flow model | Minimum    
Unobservable input    
Lapse (as a percent) 2.20%pl_FairValueInputsLapseRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Nonperformance risk (as a percent) 0.14%us-gaap_FairValueInputsCounterpartyCreditRisk
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Asset earned rate (as a percent) 3.71%pl_FairValueInputsAssetEarnedRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Return on assets (as a percent) 1.50%pl_FairValueInputsAssetInvestmentYield
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Level 3 | Annuity account | Actuarial cash flow model | Maximum    
Unobservable input    
Lapse (as a percent) 33.00%pl_FairValueInputsLapseRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Nonperformance risk (as a percent) 0.99%us-gaap_FairValueInputsCounterpartyCreditRisk
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Asset earned rate (as a percent) 5.77%pl_FairValueInputsAssetEarnedRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Return on assets (as a percent) 1.85%pl_FairValueInputsAssetInvestmentYield
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Asset-Backed Securities | Level 2    
Determination of fair values    
Fair Value 3,500,000,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesMember
 
Asset-Backed Securities | Level 3    
Determination of fair values    
Fair Value 770,600,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesMember
 
Other asset-backed securities | Level 3    
Determination of fair values    
Fair Value 600,073,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember
 
Percentage of underlying collateral of student-loan backed auction rate securities guaranteed by the Federal Family Education Loan Program ("FFELP"), minimum 97.00%pl_PercentageOfUnderlyingCollateralGuaranteedByThirdPartyMinimum
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember
 
Annuity account balances    
Financial instruments that are valued using broker quotes 170,600,000pl_FinancialInstrumentsValuedUsingBrokerQuotesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember
 
Other asset-backed securities | Level 3 | Discounted cash flow | Minimum    
Unobservable input    
Liquidity premium (as a percent) 0.52%pl_FairValueInputsLiquidityPremium
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= pl_DiscountedCashFlowMember
 
Paydown rate (as a percent) 9.70%pl_FairValueInputsPaydownRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= pl_DiscountedCashFlowMember
 
Other asset-backed securities | Level 3 | Discounted cash flow | Maximum    
Unobservable input    
Liquidity premium (as a percent) 1.50%pl_FairValueInputsLiquidityPremium
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= pl_DiscountedCashFlowMember
 
Paydown rate (as a percent) 16.93%pl_FairValueInputsPaydownRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= pl_DiscountedCashFlowMember
 
Other asset-backed securities | Level 3 | Discounted cash flow | Weighted average    
Unobservable input    
Liquidity premium (as a percent) 0.91%pl_FairValueInputsLiquidityPremium
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ValuationTechniqueAxis
= pl_DiscountedCashFlowMember
 
Paydown rate (as a percent) 12.22%pl_FairValueInputsPaydownRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ValuationTechniqueAxis
= pl_DiscountedCashFlowMember
 
Other asset-backed securities | Level 3 | Available-for-sale securities.    
Determination of fair values    
Fair Value 600,100,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember
 
Other asset-backed securities | Level 3 | Trading securities.    
Determination of fair values    
Fair Value 170,500,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_TradingAccountAssetsMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember
 
Corporate Bonds, U.S. Government-Related Securities, and Other Government Related Securities | Level 2    
Determination of fair values    
Fair Value 30,600,000,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InvestmentTypeAxis
= pl_CorporateBondsAndSecuritiesMember
 
Corporate Bonds, U.S. Government-Related Securities, and Other Government Related Securities | Level 3    
Determination of fair values    
Fair Value 1,300,000,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_CorporateBondsAndSecuritiesMember
 
Embedded derivative - GMWB    
Liabilities:    
Fair value 2,500,000,000us-gaap_DerivativeLiabilities
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeGMWBMember
 
Annuity account balances    
Discount rate curve, base rate LIBOR  
Embedded derivative - GMWB | Minimum    
Unobservable input    
Mortality (as a percent) 44.50%pl_FairValueInputsMortalityRate
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeGMWBMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Embedded derivative - GMWB | Maximum    
Unobservable input    
Mortality (as a percent) 100.00%pl_FairValueInputsMortalityRate
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeGMWBMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Embedded derivative - GMWB | Trading securities.    
Determination of fair values    
Fair Value 2,800,000,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_InvestmentSecondaryCategorizationAxis
= us-gaap_TradingAccountAssetsMember
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeGMWBMember
 
Embedded derivative - GMWB | Level 3    
Liabilities:    
Fair value 72,770,000us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeGMWBMember
 
Embedded derivative - GMWB | Level 3 | Actuarial cash flow model    
Unobservable input    
Utilization (as a percent) 99.00%pl_FairValueInputsUtilizationRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeGMWBMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Policies that have a one-time over-utilization rate of a specified amount (as a percent) 10.00%pl_PoliciesWithOneTimeOverUtilizationRateOfSpecifiedAmountPercent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeGMWBMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Specified level of one-time over-utilization (as a percent) 400.00%pl_SpecifiedLevelOfOneTimeOverUtilizationRatePercent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeGMWBMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Embedded derivative - GMWB | Level 3 | Actuarial cash flow model | Minimum    
Unobservable input    
Lapse (as a percent) 0.29%pl_FairValueInputsLapseRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeGMWBMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Nonperformance risk (as a percent) 0.14%us-gaap_FairValueInputsCounterpartyCreditRisk
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeGMWBMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Embedded derivative - GMWB | Level 3 | Actuarial cash flow model | Maximum    
Unobservable input    
Lapse (as a percent) 17.00%pl_FairValueInputsLapseRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeGMWBMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Nonperformance risk (as a percent) 0.99%us-gaap_FairValueInputsCounterpartyCreditRisk
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeGMWBMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Equity securities | Level 3    
Annuity account balances    
Financial instruments that are valued using broker quotes 3,000,000pl_FinancialInstrumentsValuedUsingBrokerQuotesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
 
Equity securities | Level 2 and Level 3    
Determination of fair values    
Fair Value 81,700,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= pl_FairValueInputsLevel2AndLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
 
Federal Home Loan Bank Stock 66,000,000us-gaap_FederalHomeLoanBankStock
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= pl_FairValueInputsLevel2AndLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
 
Corporate securities | Level 3    
Determination of fair values    
Fair Value 1,238,548,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateBondSecuritiesMember
 
Annuity account balances    
Financial instruments that are valued using broker quotes 64,200,000pl_FinancialInstrumentsValuedUsingBrokerQuotesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateBondSecuritiesMember
 
Corporate securities | Level 3 | Discounted cash flow | Minimum    
Unobservable input    
Spread over treasury (as a percent) 0.53%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= pl_DiscountedCashFlowMember
 
Corporate securities | Level 3 | Discounted cash flow | Maximum    
Unobservable input    
Spread over treasury (as a percent) 14.07%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= pl_DiscountedCashFlowMember
 
Corporate securities | Level 3 | Discounted cash flow | Weighted average    
Unobservable input    
Spread over treasury (as a percent) 2.45%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ValuationTechniqueAxis
= pl_DiscountedCashFlowMember
 
Embedded derivative - FIA    
Annuity account balances    
Discount rate curve, base rate LIBOR  
Embedded derivative - FIA | Minimum    
Unobservable input    
Mortality (as a percent) 49.00%pl_FairValueInputsMortalityRate
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeFIAMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Embedded derivative - FIA | Maximum    
Unobservable input    
Mortality (as a percent) 80.00%pl_FairValueInputsMortalityRate
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeFIAMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Embedded derivative - FIA | Level 3    
Liabilities:    
Fair value 83,119,000us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeFIAMember
 
Embedded derivative - FIA | Level 3 | Actuarial cash flow model    
Unobservable input    
Expenses per Policy 80pl_FairValueInputsAssetExpenseRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeFIAMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Embedded derivative - FIA | Level 3 | Actuarial cash flow model | Minimum    
Unobservable input    
Lapse (as a percent) 2.50%pl_FairValueInputsLapseRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeFIAMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Nonperformance risk (as a percent) 0.14%us-gaap_FairValueInputsCounterpartyCreditRisk
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeFIAMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Withdrawal rate (as a percent) 1.10%pl_FairValueInputsAssetWithdrawalRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeFIAMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Embedded derivative - FIA | Level 3 | Actuarial cash flow model | Maximum    
Unobservable input    
Lapse (as a percent) 40.00%pl_FairValueInputsLapseRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeFIAMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Nonperformance risk (as a percent) 0.99%us-gaap_FairValueInputsCounterpartyCreditRisk
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeFIAMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Withdrawal rate (as a percent) 4.50%pl_FairValueInputsAssetWithdrawalRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeFIAMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Embedded derivative - IUL    
Annuity account balances    
Discount rate curve, base rate LIBOR  
Embedded derivative - IUL | Minimum    
Unobservable input    
Mortality (as a percent) 37.00%pl_FairValueInputsMortalityRate
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeIulMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Embedded derivative - IUL | Maximum    
Unobservable input    
Mortality (as a percent) 74.00%pl_FairValueInputsMortalityRate
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeIulMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Embedded derivative - IUL | Level 3    
Liabilities:    
Fair value 8,599,000us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeIulMember
 
Embedded derivative - IUL | Level 3 | Actuarial cash flow model | Minimum    
Unobservable input    
Mortality (as a percent) 44.00%pl_FairValueInputsMortalityRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeIulMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Lapse (as a percent) 0.50%pl_FairValueInputsLapseRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeIulMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Nonperformance risk (as a percent) 0.14%us-gaap_FairValueInputsCounterpartyCreditRisk
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeIulMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Embedded derivative - IUL | Level 3 | Actuarial cash flow model | Maximum    
Unobservable input    
Mortality (as a percent) 137.00%pl_FairValueInputsMortalityRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeIulMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Lapse (as a percent) 10.00%pl_FairValueInputsLapseRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeIulMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Nonperformance risk (as a percent) 0.99%us-gaap_FairValueInputsCounterpartyCreditRisk
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeIulMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
 
Predecessor    
Liabilities:    
Fair value   820,739,000us-gaap_DerivativeLiabilities
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Level 3    
Annuity account balances    
Financial instruments that are valued using broker quotes   240,300,000pl_FinancialInstrumentsValuedUsingBrokerQuotesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Financial instruments with book value approximating fair value   73,700,000us-gaap_FinancialInstrumentsOwnedOtherAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Level 3 | Annuity account    
Liabilities:    
Fair value   97,825,000us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Level 3 | Annuity account | Actuarial cash flow model    
Unobservable input    
Withdrawal rate (as a percent)   2.20%pl_FairValueInputsAssetWithdrawalRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Predecessor | Level 3 | Annuity account | Actuarial cash flow model | Minimum    
Unobservable input    
Mortality (as a percent)   49.00%pl_FairValueInputsMortalityRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Lapse (as a percent)   2.20%pl_FairValueInputsLapseRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Nonperformance risk (as a percent)   0.12%us-gaap_FairValueInputsCounterpartyCreditRisk
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Asset earned rate (as a percent)   3.86%pl_FairValueInputsAssetEarnedRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Expenses per Policy   88pl_FairValueInputsAssetExpenseRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Return on assets (as a percent)   1.50%pl_FairValueInputsAssetInvestmentYield
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Predecessor | Level 3 | Annuity account | Actuarial cash flow model | Maximum    
Unobservable input    
Mortality (as a percent)   80.00%pl_FairValueInputsMortalityRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Lapse (as a percent)   33.00%pl_FairValueInputsLapseRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Nonperformance risk (as a percent)   0.96%us-gaap_FairValueInputsCounterpartyCreditRisk
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Asset earned rate (as a percent)   5.92%pl_FairValueInputsAssetEarnedRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Expenses per Policy   102pl_FairValueInputsAssetExpenseRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Return on assets (as a percent)   1.85%pl_FairValueInputsAssetInvestmentYield
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Predecessor | Other asset-backed securities    
Determination of fair values    
Percentage of underlying collateral of student-loan backed auction rate securities guaranteed by the Federal Family Education Loan Program ("FFELP"), minimum   97.00%pl_PercentageOfUnderlyingCollateralGuaranteedByThirdPartyMinimum
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Other asset-backed securities | Level 3    
Determination of fair values    
Fair Value   563,752,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Annuity account balances    
Financial instruments that are valued using broker quotes   169,700,000pl_FinancialInstrumentsValuedUsingBrokerQuotesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Other asset-backed securities | Level 3 | Discounted cash flow | Minimum    
Unobservable input    
Liquidity premium (as a percent)   0.39%pl_FairValueInputsLiquidityPremium
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_DiscountedCashFlowMember
Paydown rate (as a percent)   9.70%pl_FairValueInputsPaydownRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_DiscountedCashFlowMember
Predecessor | Other asset-backed securities | Level 3 | Discounted cash flow | Maximum    
Unobservable input    
Liquidity premium (as a percent)   1.49%pl_FairValueInputsLiquidityPremium
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_DiscountedCashFlowMember
Paydown rate (as a percent)   15.80%pl_FairValueInputsPaydownRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_DiscountedCashFlowMember
Predecessor | Other asset-backed securities | Level 3 | Discounted cash flow | Weighted average    
Unobservable input    
Liquidity premium (as a percent)   0.69%pl_FairValueInputsLiquidityPremium
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_DiscountedCashFlowMember
Paydown rate (as a percent)   12.08%pl_FairValueInputsPaydownRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_DiscountedCashFlowMember
Predecessor | Embedded derivative - GMWB | Level 3    
Liabilities:    
Fair value   245,090,000us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeGMWBMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Embedded derivative - GMWB | Level 3 | Actuarial cash flow model | Minimum    
Unobservable input    
Mortality (as a percent)   44.50%pl_FairValueInputsMortalityRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeGMWBMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Lapse (as a percent)   0.25%pl_FairValueInputsLapseRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeGMWBMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Utilization (as a percent)   97.00%pl_FairValueInputsUtilizationRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeGMWBMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Nonperformance risk (as a percent)   0.12%us-gaap_FairValueInputsCounterpartyCreditRisk
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeGMWBMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Predecessor | Embedded derivative - GMWB | Level 3 | Actuarial cash flow model | Maximum    
Unobservable input    
Mortality (as a percent)   100.00%pl_FairValueInputsMortalityRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeGMWBMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Lapse (as a percent)   17.00%pl_FairValueInputsLapseRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeGMWBMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Utilization (as a percent)   101.00%pl_FairValueInputsUtilizationRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeGMWBMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Nonperformance risk (as a percent)   0.96%us-gaap_FairValueInputsCounterpartyCreditRisk
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeGMWBMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Predecessor | Equity securities | Level 3    
Annuity account balances    
Financial instruments that are valued using broker quotes   3,000,000pl_FinancialInstrumentsValuedUsingBrokerQuotesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Financial instruments with book value approximating fair value   70,000,000us-gaap_FinancialInstrumentsOwnedOtherAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Corporate securities | Level 3    
Determination of fair values    
Fair Value   1,282,864,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Annuity account balances    
Financial instruments that are valued using broker quotes   67,600,000pl_FinancialInstrumentsValuedUsingBrokerQuotesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Corporate securities | Level 3 | Discounted cash flow | Minimum    
Unobservable input    
Spread over treasury (as a percent)   0.33%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_DiscountedCashFlowMember
Predecessor | Corporate securities | Level 3 | Discounted cash flow | Maximum    
Unobservable input    
Spread over treasury (as a percent)   7.50%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_DiscountedCashFlowMember
Predecessor | Corporate securities | Level 3 | Discounted cash flow | Weighted average    
Unobservable input    
Spread over treasury (as a percent)   2.19%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_DiscountedCashFlowMember
Predecessor | Fixed income securities | Level 3    
Annuity account balances    
Financial instruments with book value approximating fair value   3,700,000us-gaap_FinancialInstrumentsOwnedOtherAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_DebtSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Embedded derivative - FIA | Level 3    
Liabilities:    
Fair value   124,465,000us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeFIAMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Embedded derivative - FIA | Level 3 | Actuarial cash flow model | Minimum    
Unobservable input    
Mortality (as a percent)   49.00%pl_FairValueInputsMortalityRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeFIAMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Lapse (as a percent)   2.50%pl_FairValueInputsLapseRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeFIAMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Nonperformance risk (as a percent)   0.12%us-gaap_FairValueInputsCounterpartyCreditRisk
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeFIAMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Expenses per Policy   83pl_FairValueInputsAssetExpenseRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeFIAMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Withdrawal rate (as a percent)   1.10%pl_FairValueInputsAssetWithdrawalRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeFIAMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Predecessor | Embedded derivative - FIA | Level 3 | Actuarial cash flow model | Maximum    
Unobservable input    
Mortality (as a percent)   80.00%pl_FairValueInputsMortalityRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeFIAMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Lapse (as a percent)   40.00%pl_FairValueInputsLapseRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeFIAMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Nonperformance risk (as a percent)   0.96%us-gaap_FairValueInputsCounterpartyCreditRisk
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeFIAMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Expenses per Policy   97pl_FairValueInputsAssetExpenseRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeFIAMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Withdrawal rate (as a percent)   4.50%pl_FairValueInputsAssetWithdrawalRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeFIAMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Predecessor | Embedded derivative - IUL | Level 3    
Liabilities:    
Fair value   6,691,000us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeIulMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Embedded derivative - IUL | Level 3 | Actuarial cash flow model | Minimum    
Unobservable input    
Mortality (as a percent)   37.00%pl_FairValueInputsMortalityRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeIulMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Lapse (as a percent)   0.50%pl_FairValueInputsLapseRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeIulMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Nonperformance risk (as a percent)   0.12%us-gaap_FairValueInputsCounterpartyCreditRisk
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeIulMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Predecessor | Embedded derivative - IUL | Level 3 | Actuarial cash flow model | Maximum    
Unobservable input    
Mortality (as a percent)   74.00%pl_FairValueInputsMortalityRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeIulMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Lapse (as a percent)   10.00%pl_FairValueInputsLapseRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeIulMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember
Nonperformance risk (as a percent)   0.96%us-gaap_FairValueInputsCounterpartyCreditRisk
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= pl_EmbeddedDerivativeIulMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_ValuationTechniqueAxis
= pl_ActuarialCashFlowModelMember