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Separate Accounts, Death Benefits and Other Insurance Benefit Features and Embedded Product Derivatives Non-Insurance Guaranteed Product Features (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Account Value $ 784.0pnx_AdditionalInsuranceBenefits $ 929.0pnx_AdditionalInsuranceBenefits
Average Attained Age of Annuitant 65 years 64 years
GMWB    
Account Value 471.3pnx_AdditionalInsuranceBenefits
/ us-gaap_ProductOrServiceAxis
= pnx_GMWBMember		 551.1pnx_AdditionalInsuranceBenefits
/ us-gaap_ProductOrServiceAxis
= pnx_GMWBMember
Average Attained Age of Annuitant 65 years 64 years
GMAB    
Account Value 305.8pnx_AdditionalInsuranceBenefits
/ us-gaap_ProductOrServiceAxis
= pnx_GMABMember		 370.9pnx_AdditionalInsuranceBenefits
/ us-gaap_ProductOrServiceAxis
= pnx_GMABMember
Average Attained Age of Annuitant 59 years 59 years
COMBO    
Account Value $ 6.9pnx_AdditionalInsuranceBenefits
/ us-gaap_ProductOrServiceAxis
= pnx_COMBOMember		 $ 7.0pnx_AdditionalInsuranceBenefits
/ us-gaap_ProductOrServiceAxis
= pnx_COMBOMember
Average Attained Age of Annuitant 64 years 63 years