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Investments - Schedule of Credit Quality of Asset-Based Loan Portfolio (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Sep. 30, 2014
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage $ 206.8us-gaap_LoansReceivableCommercialMortgage $ 136.2us-gaap_LoansReceivableCommercialMortgage
Commercial Mortgage Receivable, Percentage of Total 100.00%hrg_CommercialMortgageReceivablePercentageofTotal 100.00%hrg_CommercialMortgageReceivablePercentageofTotal
Asset-based loans, by credit quality rating    
Total asset-backed loans 799.4hrg_AssetBackedLoansAndOtherInvestedAssetsGross 818.8hrg_AssetBackedLoansAndOtherInvestedAssetsGross
Substandard [Member]    
Asset-based loans, by credit quality rating    
Total asset-backed loans 481.8hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 250.8hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Special Mention [Member]    
Asset-based loans, by credit quality rating    
Total asset-backed loans 108.5hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 372.7hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Pass [Member]    
Asset-based loans, by credit quality rating    
Total asset-backed loans 209.1hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 195.3hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
LTV Less Than 50 Percent [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 45.1us-gaap_LoansReceivableCommercialMortgage
/ hrg_LoantoValueAxis
= hrg_LTVLessThan50PercentMember		 45.4us-gaap_LoansReceivableCommercialMortgage
/ hrg_LoantoValueAxis
= hrg_LTVLessThan50PercentMember
Commercial Mortgage Receivable, Percentage of Total 21.80%hrg_CommercialMortgageReceivablePercentageofTotal
/ hrg_LoantoValueAxis
= hrg_LTVLessThan50PercentMember		 33.30%hrg_CommercialMortgageReceivablePercentageofTotal
/ hrg_LoantoValueAxis
= hrg_LTVLessThan50PercentMember
LTV 50 to 60 Percent [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 51.4us-gaap_LoansReceivableCommercialMortgage
/ hrg_LoantoValueAxis
= hrg_LTV50to60PercentMember		 19.9us-gaap_LoansReceivableCommercialMortgage
/ hrg_LoantoValueAxis
= hrg_LTV50to60PercentMember
Commercial Mortgage Receivable, Percentage of Total 24.90%hrg_CommercialMortgageReceivablePercentageofTotal
/ hrg_LoantoValueAxis
= hrg_LTV50to60PercentMember		 14.60%hrg_CommercialMortgageReceivablePercentageofTotal
/ hrg_LoantoValueAxis
= hrg_LTV50to60PercentMember
LTV 60 to 75 Percent [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 110.3us-gaap_LoansReceivableCommercialMortgage
/ hrg_LoantoValueAxis
= hrg_LTV60to75PercentMember		 70.9us-gaap_LoansReceivableCommercialMortgage
/ hrg_LoantoValueAxis
= hrg_LTV60to75PercentMember
Commercial Mortgage Receivable, Percentage of Total 53.30%hrg_CommercialMortgageReceivablePercentageofTotal
/ hrg_LoantoValueAxis
= hrg_LTV60to75PercentMember		 52.10%hrg_CommercialMortgageReceivablePercentageofTotal
/ hrg_LoantoValueAxis
= hrg_LTV60to75PercentMember
Greater Than One Point Two Five [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 186.0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOnePointTwoFiveMember		 135.4us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOnePointTwoFiveMember
Greater Than One Point Two Five [Member] | LTV Less Than 50 Percent [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 44.3us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOnePointTwoFiveMember
/ hrg_LoantoValueAxis
= hrg_LTVLessThan50PercentMember		 44.6us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOnePointTwoFiveMember
/ hrg_LoantoValueAxis
= hrg_LTVLessThan50PercentMember
Greater Than One Point Two Five [Member] | LTV 50 to 60 Percent [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 51.4us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOnePointTwoFiveMember
/ hrg_LoantoValueAxis
= hrg_LTV50to60PercentMember		 19.9us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOnePointTwoFiveMember
/ hrg_LoantoValueAxis
= hrg_LTV50to60PercentMember
Greater Than One Point Two Five [Member] | LTV 60 to 75 Percent [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 90.3us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOnePointTwoFiveMember
/ hrg_LoantoValueAxis
= hrg_LTV60to75PercentMember		 70.9us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOnePointTwoFiveMember
/ hrg_LoantoValueAxis
= hrg_LTV60to75PercentMember
Greater Than One But Less Than One Point Two Five [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 20.0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOneButLessThanOnePointTwoFiveMember		 0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOneButLessThanOnePointTwoFiveMember
Greater Than One But Less Than One Point Two Five [Member] | LTV Less Than 50 Percent [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOneButLessThanOnePointTwoFiveMember
/ hrg_LoantoValueAxis
= hrg_LTVLessThan50PercentMember		 0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOneButLessThanOnePointTwoFiveMember
/ hrg_LoantoValueAxis
= hrg_LTVLessThan50PercentMember
Greater Than One But Less Than One Point Two Five [Member] | LTV 50 to 60 Percent [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOneButLessThanOnePointTwoFiveMember
/ hrg_LoantoValueAxis
= hrg_LTV50to60PercentMember		 0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOneButLessThanOnePointTwoFiveMember
/ hrg_LoantoValueAxis
= hrg_LTV50to60PercentMember
Greater Than One But Less Than One Point Two Five [Member] | LTV 60 to 75 Percent [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 20.0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOneButLessThanOnePointTwoFiveMember
/ hrg_LoantoValueAxis
= hrg_LTV60to75PercentMember		 0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_GreaterThanOneButLessThanOnePointTwoFiveMember
/ hrg_LoantoValueAxis
= hrg_LTV60to75PercentMember
Ratio Not Available [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 0.8us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_RatioNotAvailableMember		 0.8us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_RatioNotAvailableMember
Ratio Not Available [Member] | LTV Less Than 50 Percent [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 0.8us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_RatioNotAvailableMember
/ hrg_LoantoValueAxis
= hrg_LTVLessThan50PercentMember		 0.8us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_RatioNotAvailableMember
/ hrg_LoantoValueAxis
= hrg_LTVLessThan50PercentMember
Ratio Not Available [Member] | LTV 50 to 60 Percent [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_RatioNotAvailableMember
/ hrg_LoantoValueAxis
= hrg_LTV50to60PercentMember		 0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_RatioNotAvailableMember
/ hrg_LoantoValueAxis
= hrg_LTV50to60PercentMember
Ratio Not Available [Member] | LTV 60 to 75 Percent [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_RatioNotAvailableMember
/ hrg_LoantoValueAxis
= hrg_LTV60to75PercentMember		 0us-gaap_LoansReceivableCommercialMortgage
/ hrg_DebtServiceCoverageAxis
= hrg_RatioNotAvailableMember
/ hrg_LoantoValueAxis
= hrg_LTV60to75PercentMember
Estimate of Fair Value Measurement [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 206.8us-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
Estimate of Fair Value Measurement [Member] | LTV Less Than 50 Percent [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 45.1us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ hrg_LoantoValueAxis
= hrg_LTVLessThan50PercentMember		 45.4us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ hrg_LoantoValueAxis
= hrg_LTVLessThan50PercentMember
Commercial Mortgage Receivable, Percentage of Total 21.80%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ hrg_LoantoValueAxis
= hrg_LTVLessThan50PercentMember		 33.30%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ hrg_LoantoValueAxis
= hrg_LTVLessThan50PercentMember
Estimate of Fair Value Measurement [Member] | LTV 50 to 60 Percent [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 51.4us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ hrg_LoantoValueAxis
= hrg_LTV50to60PercentMember		 19.9us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ hrg_LoantoValueAxis
= hrg_LTV50to60PercentMember
Commercial Mortgage Receivable, Percentage of Total 24.90%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ hrg_LoantoValueAxis
= hrg_LTV50to60PercentMember		 14.60%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ hrg_LoantoValueAxis
= hrg_LTV50to60PercentMember
Estimate of Fair Value Measurement [Member] | LTV 60 to 75 Percent [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage $ 110.3us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ hrg_LoantoValueAxis
= hrg_LTV60to75PercentMember		 $ 70.9us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ hrg_LoantoValueAxis
= hrg_LTV60to75PercentMember
Commercial Mortgage Receivable, Percentage of Total 53.30%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ hrg_LoantoValueAxis
= hrg_LTV60to75PercentMember		 52.10%hrg_CommercialMortgageReceivablePercentageofTotal
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ hrg_LoantoValueAxis
= hrg_LTV60to75PercentMember