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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (Annuity account, USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Guaranteed minimum withdrawal benefits (GMWB)
  
Guaranteed Minimum Withdrawal Benefits  
Decrease in net liability $ 69.4plico_DecreaseInLiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitAsset
/ us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumWithdrawalBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
Guaranteed benefit asset, net 10.8plico_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitAssetNet
/ us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumWithdrawalBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
Guaranteed minimum death benefits (GMDB)
  
Guaranteed Minimum Withdrawal Benefits  
GMDB reserve $ 25.6us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitLiabilityGross
/ us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember