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Derivative Financial Instruments - Summary of Gain (Loss) Recognized in Income on Derivatives (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items] |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | $ 0.6 us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet |
Equity conversion feature of preferred stock [Member] | Gain from the change in the fair value of the equity conversion feature of preferred stock [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Three months ended December 31, | 0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = hrg_EquityConversionFeatureOfPreferredStockMember / us-gaap_IncomeStatementLocationAxis = hrg_IncreaseDecreaseInFairValueOfEquityConversionFeatureOfPreferredStockMember | (47.2)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = hrg_EquityConversionFeatureOfPreferredStockMember / us-gaap_IncomeStatementLocationAxis = hrg_IncreaseDecreaseInFairValueOfEquityConversionFeatureOfPreferredStockMember
Commodity contracts [Member] | Other (expense) income, net [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Three months ended December 31, | 18.7 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = hrg_OtherIncomeExpenseMember | (3.4)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = hrg_OtherIncomeExpenseMember
Bronze Commodity Contract [Member] | Consumer products cost of goods sold [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Three months ended December 31, | 0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = hrg_BronzeCommodityContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | (0.1)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = hrg_BronzeCommodityContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Bronze Commodity Contract [Member] | Net investment gains [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Three months ended December 31, | 0.6 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = hrg_BronzeCommodityContractMember / us-gaap_IncomeStatementLocationAxis = hrg_NetRealizedInvestmentGainsMember | 0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = hrg_BronzeCommodityContractMember / us-gaap_IncomeStatementLocationAxis = hrg_NetRealizedInvestmentGainsMember
Foreign Exchange Contract [Member] | Other (expense) income, net [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Three months ended December 31, | (1.7)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IncomeStatementLocationAxis = hrg_OtherIncomeExpenseMember | 0.8 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IncomeStatementLocationAxis = hrg_OtherIncomeExpenseMember
Call options [Member] | Net investment gains [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Three months ended December 31, | 41.3 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CallOptionMember / us-gaap_IncomeStatementLocationAxis = hrg_NetRealizedInvestmentGainsMember | 114.3 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CallOptionMember / us-gaap_IncomeStatementLocationAxis = hrg_NetRealizedInvestmentGainsMember
Futures contracts [Member] | Net investment gains [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Three months ended December 31, | 4.2 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember / us-gaap_IncomeStatementLocationAxis = hrg_NetRealizedInvestmentGainsMember | 13.1 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember / us-gaap_IncomeStatementLocationAxis = hrg_NetRealizedInvestmentGainsMember
FIA embedded derivatives [Member] | Benefits and other changes in policy reserves [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Three months ended December 31, | $ 232.1 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = hrg_FiaEmbeddedDerivativesMember / us-gaap_IncomeStatementLocationAxis = hrg_BenefitsAndOtherChangesInPolicyReservesMember | $ 100.3 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = hrg_FiaEmbeddedDerivativesMember / us-gaap_IncomeStatementLocationAxis = hrg_BenefitsAndOtherChangesInPolicyReservesMember

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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