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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 | $ 694.0 hrg_AssetBackedLoansAndOtherInvestedAssetsGross |  | $ 694.0 hrg_AssetBackedLoansAndOtherInvestedAssetsGross |  |  | $ 818.8 hrg_AssetBackedLoansAndOtherInvestedAssetsGross |  |
Long-term Debt | 5,658.3 us-gaap_LongTermDebt |  | 5,658.3 us-gaap_LongTermDebt |  |  | 5,194.5 us-gaap_LongTermDebt |  |
Asset-backed loans | 660.2 hrg_AssetBackedLoansAndOtherInvestedAssets |  | 660.2 hrg_AssetBackedLoansAndOtherInvestedAssets |  |  | 811.6 hrg_AssetBackedLoansAndOtherInvestedAssets |  |
Industry holdings, number of top investments | 10 hrg_IndustryHoldingsNumberOfTopInvestments |  | 10 hrg_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 | 19,752.6 hrg_AvailableForSaleSecuritiesCarryingValue |  | 19,752.6 hrg_AvailableForSaleSecuritiesCarryingValue |  |  | 19,252.5 hrg_AvailableForSaleSecuritiesCarryingValue |  |
Loans Receivable, Gross, Commercial, Mortgage | 304.4 us-gaap_LoansReceivableCommercialMortgage |  | 304.4 us-gaap_LoansReceivableCommercialMortgage |  |  | 136.2 us-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 | 304.4 us-gaap_FinancingReceivableRecordedInvestmentPastDue |  | 304.4 us-gaap_FinancingReceivableRecordedInvestmentPastDue |  |  | 136.2 us-gaap_FinancingReceivableRecordedInvestmentPastDue |  |
Financing Receivable, Allowance for Credit Losses, Write-downs | 76.6 us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs |  | 76.6 us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease) | (26.3)us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease |  |  |  |  |  |  |
Provision for Loan, Lease, and Other Losses | 102.9 us-gaap_ProvisionForLoanLeaseAndOtherLosses |  | 103.2 us-gaap_ProvisionForLoanLeaseAndOtherLosses |  | 1.8 us-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 | 0.9 hrg_UnrealizedGainRelatedToNonCreditPortionOfOtherThanTemporaryImpairmentsIncludedInAccumulatedOtherComprehensiveIncome / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_NonAgencyResidentialMortgageBackedSecuritiesMember |  | 0.9 hrg_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 | 15,985.6 us-gaap_OtherMarketableSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_NonAgencyResidentialMortgageBackedSecuritiesMember |  | 15,985.6 us-gaap_OtherMarketableSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_NonAgencyResidentialMortgageBackedSecuritiesMember |  |  |  |  | 15,009.3 us-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 | 1,202.8 us-gaap_InvestmentsFairValueDisclosure / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_StockholdersEquityTotalMember / dei_LegalEntityAxis = hrg_FidelityAndGuarantyLifeHoldingsMember |  | 1,202.8 us-gaap_InvestmentsFairValueDisclosure / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_StockholdersEquityTotalMember / dei_LegalEntityAxis = hrg_FidelityAndGuarantyLifeHoldingsMember |  |  | 768.5 us-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 | 8 hrg_NumberOfInvestmentIssuers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_StockholdersEquityTotalMember / dei_LegalEntityAxis = hrg_FidelityAndGuarantyLifeHoldingsMember |  | 8 hrg_NumberOfInvestmentIssuers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_StockholdersEquityTotalMember / dei_LegalEntityAxis = hrg_FidelityAndGuarantyLifeHoldingsMember |  |  | 4 hrg_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 |  |  | 1,805.8 hrg_AvailableForSaleSecuritiesOnFixedMaturityUnderCommitmentAgreement / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember |  | 2,627.9 hrg_AvailableForSaleSecuritiesOnFixedMaturityUnderCommitmentAgreement / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember |  |  |
Available-for-sale Securities, Gross Realized Gains |  |  | 19.8 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember |  | 22.2 us-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 | 2,273.6 hrg_InvestmentSecuritiesHeldbySubsidiariesSubjecttoSpecializedIndustryAccountingPrinciplesatFairValue / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_FairValueConcentrationOfRiskAllFinancialInstrumentsMember |  | 2,273.6 hrg_InvestmentSecuritiesHeldbySubsidiariesSubjecttoSpecializedIndustryAccountingPrinciplesatFairValue / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_FairValueConcentrationOfRiskAllFinancialInstrumentsMember |  |  | 2,240.3 hrg_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 | 83 hrg_NumberOfIssuersInInvestment / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_FairValueConcentrationOfRiskAllFinancialInstrumentsMember |  | 83 hrg_NumberOfIssuersInInvestment / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_FairValueConcentrationOfRiskAllFinancialInstrumentsMember |  |  |  |  |
Concentration [Member] | FGLH [Member] |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Fair value of investment | 187.8 us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_FairValueConcentrationOfRiskAllFinancialInstrumentsMember / dei_LegalEntityAxis = hrg_FidelityAndGuarantyLifeHoldingsMember |  | 187.8 us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_FairValueConcentrationOfRiskAllFinancialInstrumentsMember / dei_LegalEntityAxis = hrg_FidelityAndGuarantyLifeHoldingsMember |  |  | 250.0 us-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 | 21.3 hrg_AvailableForSaleDepressedSecuritiesFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = hrg_InsuranceSegmentMember |  | 21.3 hrg_AvailableForSaleDepressedSecuritiesFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = hrg_InsuranceSegmentMember |  |  | 0.2 hrg_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 | 558.4 us-gaap_SecuritiesReceivedAsCollateral / us-gaap_InvestmentTypeAxis = hrg_FHLBofAtlantaFundingAgreementCollateralHeldMember |  | 558.4 us-gaap_SecuritiesReceivedAsCollateral / us-gaap_InvestmentTypeAxis = hrg_FHLBofAtlantaFundingAgreementCollateralHeldMember |  |  | 573.2 us-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 | 17,810.6 hrg_AvailableForSaleSecuritiesCarryingValue / us-gaap_InformationByCategoryOfDebtSecurityAxis = hrg_FixedMaturitiesAvailableForSaleMember |  | 17,810.6 hrg_AvailableForSaleSecuritiesCarryingValue / us-gaap_InformationByCategoryOfDebtSecurityAxis = hrg_FixedMaturitiesAvailableForSaleMember |  |  | 17,211.5 hrg_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 | 1,931.2 hrg_AvailableForSaleSecuritiesCarryingValue / us-gaap_InformationByCategoryOfDebtSecurityAxis = hrg_FixedMaturitiesAvailableForSaleMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |  | 1,931.2 hrg_AvailableForSaleSecuritiesCarryingValue / us-gaap_InformationByCategoryOfDebtSecurityAxis = hrg_FixedMaturitiesAvailableForSaleMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |  |  | 1,792.9 hrg_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 | 19.9 us-gaap_LoansReceivableCommercialMortgage / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_IndustrialPropertyMember |  | 19.9 us-gaap_LoansReceivableCommercialMortgage / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_IndustrialPropertyMember |  |  | 0 us-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 | 47.5 us-gaap_LoansReceivableCommercialMortgage / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_WarehouseMember |  | 47.5 us-gaap_LoansReceivableCommercialMortgage / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_WarehouseMember |  |  | 48.0 us-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 | 7.6 us-gaap_LoansReceivableCommercialMortgage / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_ApartmentBuildingMember |  | 7.6 us-gaap_LoansReceivableCommercialMortgage / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_ApartmentBuildingMember |  |  | 0 us-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 | 75.7 us-gaap_LoansReceivableCommercialMortgage / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember |  | 75.7 us-gaap_LoansReceivableCommercialMortgage / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember |  |  | 44.6 us-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 | 123.1 us-gaap_LoansReceivableCommercialMortgage / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember |  | 123.1 us-gaap_LoansReceivableCommercialMortgage / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember |  |  | 5.8 us-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 | 83.8 us-gaap_LoansReceivableCommercialMortgage / us-gaap_StatementGeographicalAxis = hrg_EastNorthCentralUSMember |  | 83.8 us-gaap_LoansReceivableCommercialMortgage / us-gaap_StatementGeographicalAxis = hrg_EastNorthCentralUSMember |  |  | 27.8 us-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 | 17.9 us-gaap_LoansReceivableCommercialMortgage / us-gaap_StatementGeographicalAxis = hrg_MiddleAtlanticUSMember |  | 17.9 us-gaap_LoansReceivableCommercialMortgage / us-gaap_StatementGeographicalAxis = hrg_MiddleAtlanticUSMember |  |  | 10.9 us-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 | 65.7 us-gaap_LoansReceivableCommercialMortgage / us-gaap_StatementGeographicalAxis = hrg_PacificUSMember |  | 65.7 us-gaap_LoansReceivableCommercialMortgage / us-gaap_StatementGeographicalAxis = hrg_PacificUSMember |  |  | 61.5 us-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 | 63.8 us-gaap_LoansReceivableCommercialMortgage / us-gaap_StatementGeographicalAxis = hrg_SouthAtlanticUSMember |  | 63.8 us-gaap_LoansReceivableCommercialMortgage / us-gaap_StatementGeographicalAxis = hrg_SouthAtlanticUSMember |  |  | 0 us-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 | 5.7 us-gaap_LoansReceivableCommercialMortgage / us-gaap_StatementGeographicalAxis = hrg_WestNorthCentralUSMember |  | 5.7 us-gaap_LoansReceivableCommercialMortgage / us-gaap_StatementGeographicalAxis = hrg_WestNorthCentralUSMember |  |  | 5.8 us-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 | 19.9 us-gaap_LoansReceivableCommercialMortgage / us-gaap_StatementGeographicalAxis = hrg_WestSouthCentralUSMember |  | 19.9 us-gaap_LoansReceivableCommercialMortgage / us-gaap_StatementGeographicalAxis = hrg_WestSouthCentralUSMember |  |  | 30.2 us-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 | 283.7 us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOnePointTwoFiveMember |  | 283.7 us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOnePointTwoFiveMember |  |  | 135.4 us-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 | 19.9 us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOneButLessThanOnePointTwoFiveMember |  | 19.9 us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOneButLessThanOnePointTwoFiveMember |  |  | 0 us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOneButLessThanOnePointTwoFiveMember |  |
Ratio Not Available [Member] |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Loans Receivable, Gross, Commercial, Mortgage | 0.8 us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_RatioNotAvailableMember | [1] | 0.8 us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_RatioNotAvailableMember | [1] |  | 0.8 us-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 | 75.0 us-gaap_LoansReceivableCommercialMortgage / us-gaap_LoanToValueAxis = hrg_LTVLessThan50PercentMember |  | 75.0 us-gaap_LoansReceivableCommercialMortgage / us-gaap_LoanToValueAxis = hrg_LTVLessThan50PercentMember |  |  | 45.4 us-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 | 74.2 us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOnePointTwoFiveMember / us-gaap_LoanToValueAxis = hrg_LTVLessThan50PercentMember |  | 74.2 us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOnePointTwoFiveMember / us-gaap_LoanToValueAxis = hrg_LTVLessThan50PercentMember |  |  | 44.6 us-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 | 0 us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOneButLessThanOnePointTwoFiveMember / us-gaap_LoanToValueAxis = hrg_LTVLessThan50PercentMember |  | 0 us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOneButLessThanOnePointTwoFiveMember / us-gaap_LoanToValueAxis = hrg_LTVLessThan50PercentMember |  |  | 0 us-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 | 0.8 us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_RatioNotAvailableMember / us-gaap_LoanToValueAxis = hrg_LTVLessThan50PercentMember | [1] | 0.8 us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_RatioNotAvailableMember / us-gaap_LoanToValueAxis = hrg_LTVLessThan50PercentMember | [1] |  | 0.8 us-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 | 83.7 us-gaap_LoansReceivableCommercialMortgage / us-gaap_LoanToValueAxis = hrg_LTV50to60PercentMember |  | 83.7 us-gaap_LoansReceivableCommercialMortgage / us-gaap_LoanToValueAxis = hrg_LTV50to60PercentMember |  |  | 19.9 us-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 | 63.8 us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOnePointTwoFiveMember / us-gaap_LoanToValueAxis = hrg_LTV50to60PercentMember |  | 63.8 us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOnePointTwoFiveMember / us-gaap_LoanToValueAxis = hrg_LTV50to60PercentMember |  |  | 19.9 us-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 | 19.9 us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOneButLessThanOnePointTwoFiveMember / us-gaap_LoanToValueAxis = hrg_LTV50to60PercentMember |  | 19.9 us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOneButLessThanOnePointTwoFiveMember / us-gaap_LoanToValueAxis = hrg_LTV50to60PercentMember |  |  | 0 us-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 | 0 us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_RatioNotAvailableMember / us-gaap_LoanToValueAxis = hrg_LTV50to60PercentMember | [1] | 0 us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_RatioNotAvailableMember / us-gaap_LoanToValueAxis = hrg_LTV50to60PercentMember | [1] |  | 0 us-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 | 145.7 us-gaap_LoansReceivableCommercialMortgage / us-gaap_LoanToValueAxis = hrg_LTV60to75PercentMember |  | 145.7 us-gaap_LoansReceivableCommercialMortgage / us-gaap_LoanToValueAxis = hrg_LTV60to75PercentMember |  |  | 70.9 us-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 | 145.7 us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOnePointTwoFiveMember / us-gaap_LoanToValueAxis = hrg_LTV60to75PercentMember |  | 145.7 us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOnePointTwoFiveMember / us-gaap_LoanToValueAxis = hrg_LTV60to75PercentMember |  |  | 70.9 us-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 | 0 us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOneButLessThanOnePointTwoFiveMember / us-gaap_LoanToValueAxis = hrg_LTV60to75PercentMember |  | 0 us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOneButLessThanOnePointTwoFiveMember / us-gaap_LoanToValueAxis = hrg_LTV60to75PercentMember |  |  | 0 us-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 | 0 us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_RatioNotAvailableMember / us-gaap_LoanToValueAxis = hrg_LTV60to75PercentMember | [1] | 0 us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_RatioNotAvailableMember / us-gaap_LoanToValueAxis = hrg_LTV60to75PercentMember | [1] |  | 0 us-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 | 660.2 hrg_AssetBackedLoansAndOtherInvestedAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | [2] | 660.2 hrg_AssetBackedLoansAndOtherInvestedAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | [2] |  | 151.7 hrg_AssetBackedLoansAndOtherInvestedAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | [2] |
Loans Receivable, Gross, Commercial, Mortgage | 304.4 us-gaap_LoansReceivableCommercialMortgage / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  | 304.4 us-gaap_LoansReceivableCommercialMortgage / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |  | 136.2 us-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 | 75.0 us-gaap_LoansReceivableCommercialMortgage / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LoanToValueAxis = hrg_LTVLessThan50PercentMember |  | 75.0 us-gaap_LoansReceivableCommercialMortgage / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LoanToValueAxis = hrg_LTVLessThan50PercentMember |  |  | 45.4 us-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 | 83.7 us-gaap_LoansReceivableCommercialMortgage / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LoanToValueAxis = hrg_LTV50to60PercentMember |  | 83.7 us-gaap_LoansReceivableCommercialMortgage / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LoanToValueAxis = hrg_LTV50to60PercentMember |  |  | 19.9 us-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 | 145.7 us-gaap_LoansReceivableCommercialMortgage / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LoanToValueAxis = hrg_LTV60to75PercentMember |  | 145.7 us-gaap_LoansReceivableCommercialMortgage / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LoanToValueAxis = hrg_LTV60to75PercentMember |  |  | 70.9 us-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 | 304.4 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivables1To29DaysPastDueMember |  | 304.4 us-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 | 250.0 us-gaap_LongTermDebt / dei_LegalEntityAxis = hrg_SalusCapitalPartnersLLCMember / us-gaap_LongtermDebtTypeAxis = hrg_RadioshackMember |  | 250.0 us-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 | 150.0 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = hrg_RadioshackMember / us-gaap_StatementBusinessSegmentsAxis = hrg_InsuranceAndFinancialServicesMember |  | 150.0 us-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] |  |  |  |  |  |  |  |
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[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.

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