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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 01, 2015
Jun. 14, 2011
actions
Commitments and Contingencies [Line Items]          
Guarantor Obligations, Maximum Exposure, Undiscounted $ 24us-gaap_GuaranteeObligationsMaximumExposure     $ 28us-gaap_GuaranteeObligationsMaximumExposure  
Operating Leases, Future Minimum Commitments [Abstract]          
2015 55.5us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent        
2016 49.8us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears        
2017 38.2us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears        
2018 26.1us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears        
2019 21.3us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears        
Thereafter 46.5us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter        
Total minimum commitments 237.4us-gaap_OperatingLeasesFutureMinimumPaymentsDue        
Unrecorded Unconditional Purchase Obligation [Abstract]          
2015 314.4us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary        
2016 244.1us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary        
2017 110.8us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary        
2018 77.6us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary        
2019 0us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary        
Thereafter 0us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears        
Total minimum commitments 746.9us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount        
Operating Leases and Other Purchase Obligations [Abstract]          
Lease expense 44.8us-gaap_LeaseAndRentalExpense 45.1us-gaap_LeaseAndRentalExpense 47.8us-gaap_LeaseAndRentalExpense    
Long-term purchase obligation expense 250.2hnt_LongTermPurchaseObligationExpense 217.2hnt_LongTermPurchaseObligationExpense 214.9hnt_LongTermPurchaseObligationExpense    
Connecticut Commercial Campus [Member]          
Operating Leases [Abstract]          
Operating lease impairment 7.4hnt_Operatingleaseimpairment
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= hnt_OperatingLeaseForSheltonConnecticutMember
       
Credit adjusted risk free interest rate 3.26%hnt_CreditAdjustedRiskFreeInterestRate
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= hnt_OperatingLeaseForSheltonConnecticutMember
       
Connecticut Commercial Campus [Member] | Minimum [Member]          
Operating Leases [Abstract]          
Remaining operating lease agreement term 2 years        
Connecticut Commercial Campus [Member] | Maximum [Member]          
Operating Leases [Abstract]          
Remaining operating lease agreement term 3 years        
California Headquarters [Member]          
Operating Leases, Future Minimum Commitments [Abstract]          
Total minimum commitments 8.8us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= hnt_OperatingLeaseForWoodlandHillsCaliforniaCorporateHeadquartersMember
       
California Office Space [Member]          
Operating Leases, Future Minimum Commitments [Abstract]          
Total minimum commitments 83.9us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= hnt_OperatingLeaseForWoodlandHillsCaliforniaHealthPlanMember
       
Litigation Related to Military Family Life Consultants [Member]          
Commitments and Contingencies [Line Items]          
Number of pending litigations 3hnt_NumberOfPendingLitigations
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= hnt_LitigationRelatedtoMilitaryFamilyLifeConsultantsMember
       
Number of former MFLCs filing putative class action 2hnt_NumberofformerMFLCsfilingputativeclassaction
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= hnt_LitigationRelatedtoMilitaryFamilyLifeConsultantsMember
      2hnt_NumberofformerMFLCsfilingputativeclassaction
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= hnt_LitigationRelatedtoMilitaryFamilyLifeConsultantsMember
Number of other named plaintiffs 12hnt_Numberofothernamedplaintiffs
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= hnt_LitigationRelatedtoMilitaryFamilyLifeConsultantsMember
       
Pharmacy and Health Quality Services [Member]          
Long-Term Purchase Obligations [Abstract]          
Long-term purchase commitment, amount 122.1us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= hnt_PharmacyAndHealthRelatedMember
       
Pharmacy and Health Quality Services [Member] | Minimum [Member]          
Long-Term Purchase Obligations [Abstract]          
Remaining long term purchase obligation term 1 year        
Pharmacy and Health Quality Services [Member] | Maximum [Member]          
Long-Term Purchase Obligations [Abstract]          
Remaining long term purchase obligation term 2 years        
IT Infrastructure Management Services [Member]          
Long-Term Purchase Obligations [Abstract]          
Long-term purchase commitment, amount 101.2us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= hnt_ItInfrastructureManagementMember
       
Remaining long term purchase obligation term 1 year        
Software Applications Development Services [Member]          
Long-Term Purchase Obligations [Abstract]          
Long-term purchase commitment, amount 288.1us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= hnt_SoftwareDevelopmentAndManagementMember
       
Remaining long term purchase obligation term 4 years        
Claims Processing Services [Member]          
Long-Term Purchase Obligations [Abstract]          
Long-term purchase commitment, amount $ 25.4us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= hnt_ClaimsProcessingMember
       
Remaining long term purchase obligation term 2 years