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Investments - Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Sep. 30, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |
Total fixed maturity available-for-sale securities, Amortized Cost | $ 16,917.2 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis |
Total fixed maturity available-for-sale securities, Fair Value | 17,810.6 hrg_AvailableForSaleSecuritiesFairValueOnDebtMaturities |
Commercial Mortgage Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Other securities which provide for periodic payments, Amortized Cost | 707.2 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember |
Other securities which provide for periodic payments, Fair Value | 729.3 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember |
Structured hybrids [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Other securities which provide for periodic payments, Amortized Cost | 712.6 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_StructuredHybridsMember |
Other securities which provide for periodic payments, Fair Value | 716.3 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_StructuredHybridsMember |
Agency residential mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Other securities which provide for periodic payments, Amortized Cost | 2,107.8 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_AgencyResidentialMortgageBackedSecuritiesMember |
Other securities which provide for periodic payments, Fair Value | 2,194.3 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_AgencyResidentialMortgageBackedSecuritiesMember |
Other Invested Assets [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Trading Securities, Cost |  | 164.9 us-gaap_TradingSecuritiesCost / us-gaap_InvestmentTypeAxis = hrg_OtherInvestedAssetsMember
Other Investments Gross Unrealized Gain |  | 0.1 hrg_OtherInvestmentsGrossUnrealizedGain / us-gaap_InvestmentTypeAxis = hrg_OtherInvestedAssetsMember
Trading Securities |  | 165.0 us-gaap_TradingSecurities / us-gaap_InvestmentTypeAxis = hrg_OtherInvestedAssetsMember
Non-structured Hybrids [Member] | Corporate [Member] | Municipal [Member] | U.S. Government securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Due in one year or less, Amortized Cost | 328.2 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost / us-gaap_AmortizationExpensePerUnitOfProductionByCostCenterAxis = us-gaap_CorporateBondSecuritiesMember / us-gaap_CreditDerivativesByContractTypeAxis = hrg_NonStructuredHybridsMember / us-gaap_InvestmentTypeAxis = hrg_MunicipalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember |
Due after one year through five years, Amortized Cost | 2,292.8 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost / us-gaap_AmortizationExpensePerUnitOfProductionByCostCenterAxis = us-gaap_CorporateBondSecuritiesMember / us-gaap_CreditDerivativesByContractTypeAxis = hrg_NonStructuredHybridsMember / us-gaap_InvestmentTypeAxis = hrg_MunicipalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember |
Due after five years through ten years, Amortized Cost | 2,894.6 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost / us-gaap_AmortizationExpensePerUnitOfProductionByCostCenterAxis = us-gaap_CorporateBondSecuritiesMember / us-gaap_CreditDerivativesByContractTypeAxis = hrg_NonStructuredHybridsMember / us-gaap_InvestmentTypeAxis = hrg_MunicipalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember |
Due after ten years, Amortized Cost | 5,934.4 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost / us-gaap_AmortizationExpensePerUnitOfProductionByCostCenterAxis = us-gaap_CorporateBondSecuritiesMember / us-gaap_CreditDerivativesByContractTypeAxis = hrg_NonStructuredHybridsMember / us-gaap_InvestmentTypeAxis = hrg_MunicipalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember |
Subtotal, Amortized Cost | 11,450.0 hrg_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostExcludingSingleMaturityDate / us-gaap_AmortizationExpensePerUnitOfProductionByCostCenterAxis = us-gaap_CorporateBondSecuritiesMember / us-gaap_CreditDerivativesByContractTypeAxis = hrg_NonStructuredHybridsMember / us-gaap_InvestmentTypeAxis = hrg_MunicipalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember |
Due in one year or less, Fair Value | 330.7 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_AmortizationExpensePerUnitOfProductionByCostCenterAxis = us-gaap_CorporateBondSecuritiesMember / us-gaap_CreditDerivativesByContractTypeAxis = hrg_NonStructuredHybridsMember / us-gaap_InvestmentTypeAxis = hrg_MunicipalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember |
Due after one year through five years, Fair Value | 2,352.0 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue / us-gaap_AmortizationExpensePerUnitOfProductionByCostCenterAxis = us-gaap_CorporateBondSecuritiesMember / us-gaap_CreditDerivativesByContractTypeAxis = hrg_NonStructuredHybridsMember / us-gaap_InvestmentTypeAxis = hrg_MunicipalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember |
Due after five years through ten years, Fair Value | 3,026.7 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue / us-gaap_AmortizationExpensePerUnitOfProductionByCostCenterAxis = us-gaap_CorporateBondSecuritiesMember / us-gaap_CreditDerivativesByContractTypeAxis = hrg_NonStructuredHybridsMember / us-gaap_InvestmentTypeAxis = hrg_MunicipalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember |
Due after ten years, Fair Value | 6,530.1 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue / us-gaap_AmortizationExpensePerUnitOfProductionByCostCenterAxis = us-gaap_CorporateBondSecuritiesMember / us-gaap_CreditDerivativesByContractTypeAxis = hrg_NonStructuredHybridsMember / us-gaap_InvestmentTypeAxis = hrg_MunicipalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember |
Subtotal, Fair Value | 12,239.5 hrg_AvailableForSaleSecuritiesDebtMaturitiesFairValueExcludingSingleMaturityDate / us-gaap_AmortizationExpensePerUnitOfProductionByCostCenterAxis = us-gaap_CorporateBondSecuritiesMember / us-gaap_CreditDerivativesByContractTypeAxis = hrg_NonStructuredHybridsMember / us-gaap_InvestmentTypeAxis = hrg_MunicipalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember |
Other Investments Asset [Member] | Other Invested Assets [Member] | All Other Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Trading Securities, Cost | 341.8 us-gaap_TradingSecuritiesCost / us-gaap_InformationByCategoryOfDebtSecurityAxis = hrg_OtherInvestmentsAssetMember / us-gaap_InvestmentTypeAxis = hrg_OtherInvestedAssetsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_AllOtherSecuritiesMember |
Other Investments Gross Unrealized Gain | 0 hrg_OtherInvestmentsGrossUnrealizedGain / us-gaap_InformationByCategoryOfDebtSecurityAxis = hrg_OtherInvestmentsAssetMember / us-gaap_InvestmentTypeAxis = hrg_OtherInvestedAssetsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_AllOtherSecuritiesMember |
Other Short Term Investments Gross Unrealized Losses | 0 hrg_OtherShortTermInvestmentsGrossUnrealizedLosses / us-gaap_InformationByCategoryOfDebtSecurityAxis = hrg_OtherInvestmentsAssetMember / us-gaap_InvestmentTypeAxis = hrg_OtherInvestedAssetsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_AllOtherSecuritiesMember |
Trading Securities | $ 341.8 us-gaap_TradingSecurities / us-gaap_InformationByCategoryOfDebtSecurityAxis = hrg_OtherInvestmentsAssetMember / us-gaap_InvestmentTypeAxis = hrg_OtherInvestedAssetsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_AllOtherSecuritiesMember |

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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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