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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		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net	$ 0.4us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet	$ 0us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet	$ 1.0us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet	$ 0us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet
Equity Conversion Feature Of Preferred Stock [Member] | Increase Decrease In Fair Value Of Equity Conversion Feature Of Preferred Stock [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Three months ended March 31,	0us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = hrg_EquityConversionFeatureOfPreferredStockMember / us-gaap_IncomeStatementLocationAxis = hrg_IncreaseDecreaseInFairValueOfEquityConversionFeatureOfPreferredStockMember	(3.5)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = hrg_EquityConversionFeatureOfPreferredStockMember / us-gaap_IncomeStatementLocationAxis = hrg_IncreaseDecreaseInFairValueOfEquityConversionFeatureOfPreferredStockMember	0us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = hrg_EquityConversionFeatureOfPreferredStockMember / us-gaap_IncomeStatementLocationAxis = hrg_IncreaseDecreaseInFairValueOfEquityConversionFeatureOfPreferredStockMember	(50.7)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 March 31,	5.3us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = hrg_OtherIncomeExpenseMember	(6.8)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = hrg_OtherIncomeExpenseMember	24.0us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = hrg_OtherIncomeExpenseMember	(10.2)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 March 31,	0us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = hrg_BronzeCommodityContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	0us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = hrg_BronzeCommodityContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	0us-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 March 31,	0.4us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = hrg_BronzeCommodityContractMember / us-gaap_IncomeStatementLocationAxis = hrg_NetRealizedInvestmentGainsMember	0us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = hrg_BronzeCommodityContractMember / us-gaap_IncomeStatementLocationAxis = hrg_NetRealizedInvestmentGainsMember	1.0us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = hrg_BronzeCommodityContractMember / us-gaap_IncomeStatementLocationAxis = hrg_NetRealizedInvestmentGainsMember	0us-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 March 31,	(5.7)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IncomeStatementLocationAxis = hrg_OtherIncomeExpenseMember	(0.2)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IncomeStatementLocationAxis = hrg_OtherIncomeExpenseMember	(7.4)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IncomeStatementLocationAxis = hrg_OtherIncomeExpenseMember	0.6us-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 March 31,	(8.1)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CallOptionMember / us-gaap_IncomeStatementLocationAxis = hrg_NetRealizedInvestmentGainsMember	21.2us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CallOptionMember / us-gaap_IncomeStatementLocationAxis = hrg_NetRealizedInvestmentGainsMember	33.2us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CallOptionMember / us-gaap_IncomeStatementLocationAxis = hrg_NetRealizedInvestmentGainsMember	135.5us-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 March 31,	0.1us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember / us-gaap_IncomeStatementLocationAxis = hrg_NetRealizedInvestmentGainsMember	1.3us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember / us-gaap_IncomeStatementLocationAxis = hrg_NetRealizedInvestmentGainsMember	4.3us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember / us-gaap_IncomeStatementLocationAxis = hrg_NetRealizedInvestmentGainsMember	14.4us-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 March 31,	$ 77.2us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = hrg_FiaEmbeddedDerivativesMember / us-gaap_IncomeStatementLocationAxis = hrg_BenefitsAndOtherChangesInPolicyReservesMember	$ 74.0us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = hrg_FiaEmbeddedDerivativesMember / us-gaap_IncomeStatementLocationAxis = hrg_BenefitsAndOtherChangesInPolicyReservesMember	$ 309.3us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = hrg_FiaEmbeddedDerivativesMember / us-gaap_IncomeStatementLocationAxis = hrg_BenefitsAndOtherChangesInPolicyReservesMember	$ 174.3us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = hrg_FiaEmbeddedDerivativesMember / us-gaap_IncomeStatementLocationAxis = hrg_BenefitsAndOtherChangesInPolicyReservesMember

X

- 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=56946850&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=56946850&loc=SL5624171-113959

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X

- 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=56946850&loc=SL5624171-113959

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