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Investments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2015
Mar. 31, 2014
Sep. 30, 2014
Sep. 30, 2012
Schedule of Available-for-sale Securities [Line Items]          
Asset Backed Loans And Other Invested Assets Gross $ 694.0hrg_AssetBackedLoansAndOtherInvestedAssetsGross $ 694.0hrg_AssetBackedLoansAndOtherInvestedAssetsGross   $ 818.8hrg_AssetBackedLoansAndOtherInvestedAssetsGross  
Long-term Debt 5,658.3us-gaap_LongTermDebt 5,658.3us-gaap_LongTermDebt   5,194.5us-gaap_LongTermDebt  
Asset-backed loans 660.2hrg_AssetBackedLoansAndOtherInvestedAssets 660.2hrg_AssetBackedLoansAndOtherInvestedAssets   811.6hrg_AssetBackedLoansAndOtherInvestedAssets  
Industry holdings, number of top investments 10hrg_IndustryHoldingsNumberOfTopInvestments 10hrg_IndustryHoldingsNumberOfTopInvestments      
Equity Securities Holdings Exposure Amount of Single Issuer Greater than Stated Percentage of Total Investments 39.50%hrg_EquitySecuritiesHoldingsExposureAmountofSingleIssuerGreaterthanStatedPercentageofTotalInvestments 39.50%hrg_EquitySecuritiesHoldingsExposureAmountofSingleIssuerGreaterthanStatedPercentageofTotalInvestments      
Total investments, Carrying Value 19,752.6hrg_AvailableForSaleSecuritiesCarryingValue 19,752.6hrg_AvailableForSaleSecuritiesCarryingValue   19,252.5hrg_AvailableForSaleSecuritiesCarryingValue  
Loans Receivable, Gross, Commercial, Mortgage 304.4us-gaap_LoansReceivableCommercialMortgage 304.4us-gaap_LoansReceivableCommercialMortgage   136.2us-gaap_LoansReceivableCommercialMortgage  
Commercial Mortgage Receivable, Percentage of Total 100.00%hrg_CommercialMortgageReceivablePercentageofTotal 100.00%hrg_CommercialMortgageReceivablePercentageofTotal   100.00%hrg_CommercialMortgageReceivablePercentageofTotal  
Financing Receivable, Recorded Investment, Past Due 304.4us-gaap_FinancingReceivableRecordedInvestmentPastDue 304.4us-gaap_FinancingReceivableRecordedInvestmentPastDue   136.2us-gaap_FinancingReceivableRecordedInvestmentPastDue  
Financing Receivable, Allowance for Credit Losses, Write-downs 76.6us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs 76.6us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs      
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease) (26.3)us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease        
Provision for Loan, Lease, and Other Losses 102.9us-gaap_ProvisionForLoanLeaseAndOtherLosses 103.2us-gaap_ProvisionForLoanLeaseAndOtherLosses 1.8us-gaap_ProvisionForLoanLeaseAndOtherLosses    
Non Agency Residential Mortgage Backed Securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Unrealized gains included in AOCI related to the non-credit portion of other than-temporary impairments on non-agency residential-mortgage-backed securities 0.9hrg_UnrealizedGainRelatedToNonCreditPortionOfOtherThanTemporaryImpairmentsIncludedInAccumulatedOtherComprehensiveIncome
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_NonAgencyResidentialMortgageBackedSecuritiesMember
0.9hrg_UnrealizedGainRelatedToNonCreditPortionOfOtherThanTemporaryImpairmentsIncludedInAccumulatedOtherComprehensiveIncome
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_NonAgencyResidentialMortgageBackedSecuritiesMember
     
Unrealized losses included in AOCI related to the non-credit portion of other than-temporary impairments on non-agency residential-mortgage-backed securities (1.9)hrg_UnrealizedLossesRelatedToNonCreditPortionOfOtherThanTemporaryImpairmentsIncludedInAccumulatedOtherComprehensiveIncome
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_NonAgencyResidentialMortgageBackedSecuritiesMember
(1.9)hrg_UnrealizedLossesRelatedToNonCreditPortionOfOtherThanTemporaryImpairmentsIncludedInAccumulatedOtherComprehensiveIncome
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_NonAgencyResidentialMortgageBackedSecuritiesMember
     
Other Marketable Securities, Current 15,985.6us-gaap_OtherMarketableSecuritiesCurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_NonAgencyResidentialMortgageBackedSecuritiesMember
15,985.6us-gaap_OtherMarketableSecuritiesCurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_NonAgencyResidentialMortgageBackedSecuritiesMember
    15,009.3us-gaap_OtherMarketableSecuritiesCurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_NonAgencyResidentialMortgageBackedSecuritiesMember
FGLH [Member] | Stockholders' Equity, Total [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair value of investment 1,202.8us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_StockholdersEquityTotalMember
/ dei_LegalEntityAxis
= hrg_FidelityAndGuarantyLifeHoldingsMember
1,202.8us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_StockholdersEquityTotalMember
/ dei_LegalEntityAxis
= hrg_FidelityAndGuarantyLifeHoldingsMember
  768.5us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_StockholdersEquityTotalMember
/ dei_LegalEntityAxis
= hrg_FidelityAndGuarantyLifeHoldingsMember
 
Percentage of fair value of the invested assets portfolio 6.10%hrg_PercentageOfInvestmentsFairValueInRelationToInvestedAssetsPortfolio
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_StockholdersEquityTotalMember
/ dei_LegalEntityAxis
= hrg_FidelityAndGuarantyLifeHoldingsMember
6.10%hrg_PercentageOfInvestmentsFairValueInRelationToInvestedAssetsPortfolio
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_StockholdersEquityTotalMember
/ dei_LegalEntityAxis
= hrg_FidelityAndGuarantyLifeHoldingsMember
  4.00%hrg_PercentageOfInvestmentsFairValueInRelationToInvestedAssetsPortfolio
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_StockholdersEquityTotalMember
/ dei_LegalEntityAxis
= hrg_FidelityAndGuarantyLifeHoldingsMember
 
Investment in issuers 8hrg_NumberOfInvestmentIssuers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_StockholdersEquityTotalMember
/ dei_LegalEntityAxis
= hrg_FidelityAndGuarantyLifeHoldingsMember
8hrg_NumberOfInvestmentIssuers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_StockholdersEquityTotalMember
/ dei_LegalEntityAxis
= hrg_FidelityAndGuarantyLifeHoldingsMember
  4hrg_NumberOfInvestmentIssuers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_StockholdersEquityTotalMember
/ dei_LegalEntityAxis
= hrg_FidelityAndGuarantyLifeHoldingsMember
 
Investment Income [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Gross Realized Losses   (44.5)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InvestmentIncomeMember
(2.5)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InvestmentIncomeMember
   
Available for sale securities on fixed maturity   1,805.8hrg_AvailableForSaleSecuritiesOnFixedMaturityUnderCommitmentAgreement
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InvestmentIncomeMember
2,627.9hrg_AvailableForSaleSecuritiesOnFixedMaturityUnderCommitmentAgreement
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InvestmentIncomeMember
   
Available-for-sale Securities, Gross Realized Gains   19.8us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InvestmentIncomeMember
22.2us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InvestmentIncomeMember
   
Concentration [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Investment Securities Held by Subsidiaries Subject to Specialized Industry Accounting Principles at Fair Value 2,273.6hrg_InvestmentSecuritiesHeldbySubsidiariesSubjecttoSpecializedIndustryAccountingPrinciplesatFairValue
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= us-gaap_FairValueConcentrationOfRiskAllFinancialInstrumentsMember
2,273.6hrg_InvestmentSecuritiesHeldbySubsidiariesSubjecttoSpecializedIndustryAccountingPrinciplesatFairValue
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= us-gaap_FairValueConcentrationOfRiskAllFinancialInstrumentsMember
  2,240.3hrg_InvestmentSecuritiesHeldbySubsidiariesSubjecttoSpecializedIndustryAccountingPrinciplesatFairValue
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= us-gaap_FairValueConcentrationOfRiskAllFinancialInstrumentsMember
 
Percentage of fair value of the invested assets portfolio 11.50%hrg_PercentageOfInvestmentsFairValueInRelationToInvestedAssetsPortfolio
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= us-gaap_FairValueConcentrationOfRiskAllFinancialInstrumentsMember
11.50%hrg_PercentageOfInvestmentsFairValueInRelationToInvestedAssetsPortfolio
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= us-gaap_FairValueConcentrationOfRiskAllFinancialInstrumentsMember
  11.60%hrg_PercentageOfInvestmentsFairValueInRelationToInvestedAssetsPortfolio
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= us-gaap_FairValueConcentrationOfRiskAllFinancialInstrumentsMember
 
Number Of Issuers In Investment 83hrg_NumberOfIssuersInInvestment
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= us-gaap_FairValueConcentrationOfRiskAllFinancialInstrumentsMember
83hrg_NumberOfIssuersInInvestment
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= us-gaap_FairValueConcentrationOfRiskAllFinancialInstrumentsMember
     
Concentration [Member] | FGLH [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair value of investment 187.8us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= us-gaap_FairValueConcentrationOfRiskAllFinancialInstrumentsMember
/ dei_LegalEntityAxis
= hrg_FidelityAndGuarantyLifeHoldingsMember
187.8us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= us-gaap_FairValueConcentrationOfRiskAllFinancialInstrumentsMember
/ dei_LegalEntityAxis
= hrg_FidelityAndGuarantyLifeHoldingsMember
  250.0us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= us-gaap_FairValueConcentrationOfRiskAllFinancialInstrumentsMember
/ dei_LegalEntityAxis
= hrg_FidelityAndGuarantyLifeHoldingsMember
 
Percentage of fair value of the invested assets portfolio 1.00%hrg_PercentageOfInvestmentsFairValueInRelationToInvestedAssetsPortfolio
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= us-gaap_FairValueConcentrationOfRiskAllFinancialInstrumentsMember
/ dei_LegalEntityAxis
= hrg_FidelityAndGuarantyLifeHoldingsMember
1.00%hrg_PercentageOfInvestmentsFairValueInRelationToInvestedAssetsPortfolio
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= us-gaap_FairValueConcentrationOfRiskAllFinancialInstrumentsMember
/ dei_LegalEntityAxis
= hrg_FidelityAndGuarantyLifeHoldingsMember
  1.30%hrg_PercentageOfInvestmentsFairValueInRelationToInvestedAssetsPortfolio
/ us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis
= us-gaap_FairValueConcentrationOfRiskAllFinancialInstrumentsMember
/ dei_LegalEntityAxis
= hrg_FidelityAndGuarantyLifeHoldingsMember
 
Insurance Segment [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair value on securities 21.3hrg_AvailableForSaleDepressedSecuritiesFairValueDisclosure
/ us-gaap_StatementBusinessSegmentsAxis
= hrg_InsuranceSegmentMember
21.3hrg_AvailableForSaleDepressedSecuritiesFairValueDisclosure
/ us-gaap_StatementBusinessSegmentsAxis
= hrg_InsuranceSegmentMember
  0.2hrg_AvailableForSaleDepressedSecuritiesFairValueDisclosure
/ us-gaap_StatementBusinessSegmentsAxis
= hrg_InsuranceSegmentMember
 
Percentage of amortized cost       20.00%hrg_PercentageOfAvailableForSaleDepressedSecuritiesAboveAmortizedCost
/ us-gaap_StatementBusinessSegmentsAxis
= hrg_InsuranceSegmentMember
 
Percentage of carrying values of all investments (less than 1%)       1.00%hrg_PercentageOfAvailableForSaleDepressedSecuritiesInRelationToCarryingValuesOfAllInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= hrg_InsuranceSegmentMember
 
FHLB of Atlanta Funding Agreement Collateral Held [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Investment Owned, at Fair Value 558.4us-gaap_SecuritiesReceivedAsCollateral
/ us-gaap_InvestmentTypeAxis
= hrg_FHLBofAtlantaFundingAgreementCollateralHeldMember
558.4us-gaap_SecuritiesReceivedAsCollateral
/ us-gaap_InvestmentTypeAxis
= hrg_FHLBofAtlantaFundingAgreementCollateralHeldMember
  573.2us-gaap_SecuritiesReceivedAsCollateral
/ us-gaap_InvestmentTypeAxis
= hrg_FHLBofAtlantaFundingAgreementCollateralHeldMember
 
Fixed Maturities Available For Sale [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Total investments, Carrying Value 17,810.6hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
17,810.6hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
  17,211.5hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
 
Fixed Maturities Available For Sale [Member] | Asset-backed Securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Total investments, Carrying Value 1,931.2hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
1,931.2hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
  1,792.9hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
 
Commercial Mortgage Loan [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans and Leases Receivable, Ratio of Performing Loans to All Loans 75.00%hrg_LoansandLeasesReceivableRatioofPerformingLoanstoAllLoans
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= hrg_CommercialMortgageLoanMember
75.00%hrg_LoansandLeasesReceivableRatioofPerformingLoanstoAllLoans
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= hrg_CommercialMortgageLoanMember
     
Loan to Value, Maximum Threshold 100.00%hrg_LoantoValueMaximumThreshold
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= hrg_CommercialMortgageLoanMember
100.00%hrg_LoantoValueMaximumThreshold
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= hrg_CommercialMortgageLoanMember
     
Investments, Cost or Amortized, Percentage of Total 0.00%hrg_InvestmentsCostorAmortizedPercentageofTotal
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= hrg_CommercialMortgageLoanMember
0.00%hrg_InvestmentsCostorAmortizedPercentageofTotal
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= hrg_CommercialMortgageLoanMember
  0.00%hrg_InvestmentsCostorAmortizedPercentageofTotal
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= hrg_CommercialMortgageLoanMember
 
Industrial Property [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 19.9us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_IndustrialPropertyMember
19.9us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_IndustrialPropertyMember
  0us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_IndustrialPropertyMember
 
Commercial Mortgage Receivable, Percentage of Total 6.50%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_IndustrialPropertyMember
6.50%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_IndustrialPropertyMember
  0.00%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_IndustrialPropertyMember
 
Warehouse [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 47.5us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_WarehouseMember
47.5us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_WarehouseMember
  48.0us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_WarehouseMember
 
Commercial Mortgage Receivable, Percentage of Total 15.60%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_WarehouseMember
15.60%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_WarehouseMember
  35.20%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_WarehouseMember
 
Apartment Building [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 7.6us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_ApartmentBuildingMember
7.6us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_ApartmentBuildingMember
  0us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_ApartmentBuildingMember
 
Commercial Mortgage Receivable, Percentage of Total 2.50%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_ApartmentBuildingMember
2.50%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_ApartmentBuildingMember
  0.00%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_ApartmentBuildingMember
 
Office Building [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 75.7us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OfficeBuildingMember
75.7us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OfficeBuildingMember
  44.6us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OfficeBuildingMember
 
Commercial Mortgage Receivable, Percentage of Total 24.90%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OfficeBuildingMember
24.90%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OfficeBuildingMember
  32.70%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OfficeBuildingMember
 
Retail Site [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 123.1us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_RetailSiteMember
123.1us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_RetailSiteMember
  5.8us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_RetailSiteMember
 
Commercial Mortgage Receivable, Percentage of Total 40.40%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_RetailSiteMember
40.40%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_RetailSiteMember
  4.30%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_RetailSiteMember
 
East North Central US [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 83.8us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= hrg_EastNorthCentralUSMember
83.8us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= hrg_EastNorthCentralUSMember
  27.8us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= hrg_EastNorthCentralUSMember
 
Commercial Mortgage Receivable, Percentage of Total 27.50%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_StatementGeographicalAxis
= hrg_EastNorthCentralUSMember
27.50%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_StatementGeographicalAxis
= hrg_EastNorthCentralUSMember
  20.40%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_StatementGeographicalAxis
= hrg_EastNorthCentralUSMember
 
Middle Atlantic US [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 17.9us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= hrg_MiddleAtlanticUSMember
17.9us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= hrg_MiddleAtlanticUSMember
  10.9us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= hrg_MiddleAtlanticUSMember
 
Commercial Mortgage Receivable, Percentage of Total 5.90%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_StatementGeographicalAxis
= hrg_MiddleAtlanticUSMember
5.90%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_StatementGeographicalAxis
= hrg_MiddleAtlanticUSMember
  8.00%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_StatementGeographicalAxis
= hrg_MiddleAtlanticUSMember
 
Pacific US [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 65.7us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= hrg_PacificUSMember
65.7us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= hrg_PacificUSMember
  61.5us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= hrg_PacificUSMember
 
Commercial Mortgage Receivable, Percentage of Total 21.60%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_StatementGeographicalAxis
= hrg_PacificUSMember
21.60%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_StatementGeographicalAxis
= hrg_PacificUSMember
  45.10%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_StatementGeographicalAxis
= hrg_PacificUSMember
 
South Atlantic US [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 63.8us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= hrg_SouthAtlanticUSMember
63.8us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= hrg_SouthAtlanticUSMember
  0us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= hrg_SouthAtlanticUSMember
 
Commercial Mortgage Receivable, Percentage of Total 21.00%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_StatementGeographicalAxis
= hrg_SouthAtlanticUSMember
21.00%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_StatementGeographicalAxis
= hrg_SouthAtlanticUSMember
  0.00%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_StatementGeographicalAxis
= hrg_SouthAtlanticUSMember
 
West North Central US [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 5.7us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= hrg_WestNorthCentralUSMember
5.7us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= hrg_WestNorthCentralUSMember
  5.8us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= hrg_WestNorthCentralUSMember
 
Commercial Mortgage Receivable, Percentage of Total 1.90%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_StatementGeographicalAxis
= hrg_WestNorthCentralUSMember
1.90%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_StatementGeographicalAxis
= hrg_WestNorthCentralUSMember
  4.30%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_StatementGeographicalAxis
= hrg_WestNorthCentralUSMember
 
West South Central US [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 19.9us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= hrg_WestSouthCentralUSMember
19.9us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= hrg_WestSouthCentralUSMember
  30.2us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= hrg_WestSouthCentralUSMember
 
Commercial Mortgage Receivable, Percentage of Total 6.50%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_StatementGeographicalAxis
= hrg_WestSouthCentralUSMember
6.50%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_StatementGeographicalAxis
= hrg_WestSouthCentralUSMember
  22.20%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_StatementGeographicalAxis
= hrg_WestSouthCentralUSMember
 
Greater Than One Point Two Five [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 283.7us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOnePointTwoFiveMember
283.7us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOnePointTwoFiveMember
  135.4us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOnePointTwoFiveMember
 
Greater Than One But Less Than One Point Two Five [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 19.9us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOneButLessThanOnePointTwoFiveMember
19.9us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOneButLessThanOnePointTwoFiveMember
  0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOneButLessThanOnePointTwoFiveMember
 
Ratio Not Available [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 0.8us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_RatioNotAvailableMember
[1] 0.8us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_RatioNotAvailableMember
[1]   0.8us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_RatioNotAvailableMember
[1]  
LTV Less Than 50 Percent [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 75.0us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_LoanToValueAxis
= hrg_LTVLessThan50PercentMember
75.0us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_LoanToValueAxis
= hrg_LTVLessThan50PercentMember
  45.4us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_LoanToValueAxis
= hrg_LTVLessThan50PercentMember
 
Commercial Mortgage Receivable, Percentage of Total 24.60%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_LoanToValueAxis
= hrg_LTVLessThan50PercentMember
24.60%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_LoanToValueAxis
= hrg_LTVLessThan50PercentMember
  33.30%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_LoanToValueAxis
= hrg_LTVLessThan50PercentMember
 
LTV Less Than 50 Percent [Member] | Greater Than One Point Two Five [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 74.2us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOnePointTwoFiveMember
/ us-gaap_LoanToValueAxis
= hrg_LTVLessThan50PercentMember
74.2us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOnePointTwoFiveMember
/ us-gaap_LoanToValueAxis
= hrg_LTVLessThan50PercentMember
  44.6us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOnePointTwoFiveMember
/ us-gaap_LoanToValueAxis
= hrg_LTVLessThan50PercentMember
 
LTV Less Than 50 Percent [Member] | Greater Than One But Less Than One Point Two Five [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOneButLessThanOnePointTwoFiveMember
/ us-gaap_LoanToValueAxis
= hrg_LTVLessThan50PercentMember
0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOneButLessThanOnePointTwoFiveMember
/ us-gaap_LoanToValueAxis
= hrg_LTVLessThan50PercentMember
  0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOneButLessThanOnePointTwoFiveMember
/ us-gaap_LoanToValueAxis
= hrg_LTVLessThan50PercentMember
 
LTV Less Than 50 Percent [Member] | Ratio Not Available [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 0.8us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_RatioNotAvailableMember
/ us-gaap_LoanToValueAxis
= hrg_LTVLessThan50PercentMember
[1] 0.8us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_RatioNotAvailableMember
/ us-gaap_LoanToValueAxis
= hrg_LTVLessThan50PercentMember
[1]   0.8us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_RatioNotAvailableMember
/ us-gaap_LoanToValueAxis
= hrg_LTVLessThan50PercentMember
[1]  
LTV 50 to 60 Percent [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 83.7us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_LoanToValueAxis
= hrg_LTV50to60PercentMember
83.7us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_LoanToValueAxis
= hrg_LTV50to60PercentMember
  19.9us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_LoanToValueAxis
= hrg_LTV50to60PercentMember
 
Commercial Mortgage Receivable, Percentage of Total 27.50%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_LoanToValueAxis
= hrg_LTV50to60PercentMember
27.50%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_LoanToValueAxis
= hrg_LTV50to60PercentMember
  14.60%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_LoanToValueAxis
= hrg_LTV50to60PercentMember
 
LTV 50 to 60 Percent [Member] | Greater Than One Point Two Five [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 63.8us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOnePointTwoFiveMember
/ us-gaap_LoanToValueAxis
= hrg_LTV50to60PercentMember
63.8us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOnePointTwoFiveMember
/ us-gaap_LoanToValueAxis
= hrg_LTV50to60PercentMember
  19.9us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOnePointTwoFiveMember
/ us-gaap_LoanToValueAxis
= hrg_LTV50to60PercentMember
 
LTV 50 to 60 Percent [Member] | Greater Than One But Less Than One Point Two Five [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 19.9us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOneButLessThanOnePointTwoFiveMember
/ us-gaap_LoanToValueAxis
= hrg_LTV50to60PercentMember
19.9us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOneButLessThanOnePointTwoFiveMember
/ us-gaap_LoanToValueAxis
= hrg_LTV50to60PercentMember
  0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOneButLessThanOnePointTwoFiveMember
/ us-gaap_LoanToValueAxis
= hrg_LTV50to60PercentMember
 
LTV 50 to 60 Percent [Member] | Ratio Not Available [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_RatioNotAvailableMember
/ us-gaap_LoanToValueAxis
= hrg_LTV50to60PercentMember
[1] 0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_RatioNotAvailableMember
/ us-gaap_LoanToValueAxis
= hrg_LTV50to60PercentMember
[1]   0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_RatioNotAvailableMember
/ us-gaap_LoanToValueAxis
= hrg_LTV50to60PercentMember
[1]  
LTV 60 to 75 Percent [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 145.7us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_LoanToValueAxis
= hrg_LTV60to75PercentMember
145.7us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_LoanToValueAxis
= hrg_LTV60to75PercentMember
  70.9us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_LoanToValueAxis
= hrg_LTV60to75PercentMember
 
Commercial Mortgage Receivable, Percentage of Total 47.90%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_LoanToValueAxis
= hrg_LTV60to75PercentMember
47.90%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_LoanToValueAxis
= hrg_LTV60to75PercentMember
  52.10%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_LoanToValueAxis
= hrg_LTV60to75PercentMember
 
LTV 60 to 75 Percent [Member] | Greater Than One Point Two Five [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 145.7us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOnePointTwoFiveMember
/ us-gaap_LoanToValueAxis
= hrg_LTV60to75PercentMember
145.7us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOnePointTwoFiveMember
/ us-gaap_LoanToValueAxis
= hrg_LTV60to75PercentMember
  70.9us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOnePointTwoFiveMember
/ us-gaap_LoanToValueAxis
= hrg_LTV60to75PercentMember
 
LTV 60 to 75 Percent [Member] | Greater Than One But Less Than One Point Two Five [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOneButLessThanOnePointTwoFiveMember
/ us-gaap_LoanToValueAxis
= hrg_LTV60to75PercentMember
0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOneButLessThanOnePointTwoFiveMember
/ us-gaap_LoanToValueAxis
= hrg_LTV60to75PercentMember
  0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOneButLessThanOnePointTwoFiveMember
/ us-gaap_LoanToValueAxis
= hrg_LTV60to75PercentMember
 
LTV 60 to 75 Percent [Member] | Ratio Not Available [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_RatioNotAvailableMember
/ us-gaap_LoanToValueAxis
= hrg_LTV60to75PercentMember
[1] 0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_RatioNotAvailableMember
/ us-gaap_LoanToValueAxis
= hrg_LTV60to75PercentMember
[1]   0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_RatioNotAvailableMember
/ us-gaap_LoanToValueAxis
= hrg_LTV60to75PercentMember
[1]  
Estimate of Fair Value Measurement [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Asset-backed loans 660.2hrg_AssetBackedLoansAndOtherInvestedAssets
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[2] 660.2hrg_AssetBackedLoansAndOtherInvestedAssets
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[2]   151.7hrg_AssetBackedLoansAndOtherInvestedAssets
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[2]  
Loans Receivable, Gross, Commercial, Mortgage 304.4us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
304.4us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
  136.2us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
 
Commercial Mortgage Receivable, Percentage of Total 100.00%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
100.00%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
  100.00%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
 
Estimate of Fair Value Measurement [Member] | LTV Less Than 50 Percent [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 75.0us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LoanToValueAxis
= hrg_LTVLessThan50PercentMember
75.0us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LoanToValueAxis
= hrg_LTVLessThan50PercentMember
  45.4us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LoanToValueAxis
= hrg_LTVLessThan50PercentMember
 
Commercial Mortgage Receivable, Percentage of Total 24.60%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LoanToValueAxis
= hrg_LTVLessThan50PercentMember
24.60%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LoanToValueAxis
= hrg_LTVLessThan50PercentMember
  33.30%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LoanToValueAxis
= hrg_LTVLessThan50PercentMember
 
Estimate of Fair Value Measurement [Member] | LTV 50 to 60 Percent [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 83.7us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LoanToValueAxis
= hrg_LTV50to60PercentMember
83.7us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LoanToValueAxis
= hrg_LTV50to60PercentMember
  19.9us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LoanToValueAxis
= hrg_LTV50to60PercentMember
 
Commercial Mortgage Receivable, Percentage of Total 27.50%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LoanToValueAxis
= hrg_LTV50to60PercentMember
27.50%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LoanToValueAxis
= hrg_LTV50to60PercentMember
  14.60%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LoanToValueAxis
= hrg_LTV50to60PercentMember
 
Estimate of Fair Value Measurement [Member] | LTV 60 to 75 Percent [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 145.7us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LoanToValueAxis
= hrg_LTV60to75PercentMember
145.7us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LoanToValueAxis
= hrg_LTV60to75PercentMember
  70.9us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LoanToValueAxis
= hrg_LTV60to75PercentMember
 
Commercial Mortgage Receivable, Percentage of Total 47.90%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LoanToValueAxis
= hrg_LTV60to75PercentMember
47.90%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LoanToValueAxis
= hrg_LTV60to75PercentMember
  52.10%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LoanToValueAxis
= hrg_LTV60to75PercentMember
 
Financing Receivables, 1 to 29 Days Past Due [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Financing Receivable, Recorded Investment, Past Due 304.4us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables1To29DaysPastDueMember
304.4us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables1To29DaysPastDueMember
     
Radioshack [Member] | Salus Capital Partners L L C [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Long-term Debt 250.0us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= hrg_SalusCapitalPartnersLLCMember
/ us-gaap_LongtermDebtTypeAxis
= hrg_RadioshackMember
250.0us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= hrg_SalusCapitalPartnersLLCMember
/ us-gaap_LongtermDebtTypeAxis
= hrg_RadioshackMember
     
Radioshack [Member] | Insurance And Financial Services [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Long-term Debt 150.0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= hrg_RadioshackMember
/ us-gaap_StatementBusinessSegmentsAxis
= hrg_InsuranceAndFinancialServicesMember
150.0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= hrg_RadioshackMember
/ us-gaap_StatementBusinessSegmentsAxis
= hrg_InsuranceAndFinancialServicesMember
     
Non-Qualifying Participation [Member] | Radioshack [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Long-term Debt $ 100.0us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= hrg_RadioshackMember
/ us-gaap_LongtermDebtTypeAxis
= hrg_NonQualifyingParticipationMember
$ 100.0us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= hrg_RadioshackMember
/ us-gaap_LongtermDebtTypeAxis
= hrg_NonQualifyingParticipationMember
     
[1] (a) N/A - Current financial information not available.
[2] (a)The carrying amounts of trade receivables, accounts payable, accrued investment income and portions of other insurance liabilities approximate fair value due to their short duration and, accordingly, they are not presented in the tables above.