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Derivative Financial Instruments Derivative Financial Instruments - Oil and Gas Commodity Contracts (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Sep. 30, 2014
MMBTU
Derivative [Line Items]          
Derivative, Percentage of Production Volume Covered by Derivative Financial Instruments 38.00%hrg_DerivativePercentageOfProductionVolumeCoveredByDerivativeFinancialInstruments 69.00%hrg_DerivativePercentageOfProductionVolumeCoveredByDerivativeFinancialInstruments 55.00%hrg_DerivativePercentageOfProductionVolumeCoveredByDerivativeFinancialInstruments 0.00%hrg_DerivativePercentageOfProductionVolumeCoveredByDerivativeFinancialInstruments  
Swap [Member] | Natural Gas Commodity Contract [Member]          
Derivative [Line Items]          
Natural Gas, Volume 12,530,000hrg_DerivativeCommodityContractEnergyVolume
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_NaturalGasCommodityContractMember		   12,530,000hrg_DerivativeCommodityContractEnergyVolume
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_NaturalGasCommodityContractMember		   6,821,000hrg_DerivativeCommodityContractEnergyVolume
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_NaturalGasCommodityContractMember
Fair Value at March 31, 2015 10.4us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_NaturalGasCommodityContractMember		   10.4us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_NaturalGasCommodityContractMember		    
Swap [Member] | Natural Gas Commodity Contract [Member] | Remainder of 2014 [Member]          
Derivative [Line Items]          
Natural Gas, Volume 8,250,000hrg_DerivativeCommodityContractEnergyVolume
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_NaturalGasCommodityContractMember
/ hrg_DerivativePeriodAxis
= hrg_RemainderOfYearOneMember		   8,250,000hrg_DerivativeCommodityContractEnergyVolume
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_NaturalGasCommodityContractMember
/ hrg_DerivativePeriodAxis
= hrg_RemainderOfYearOneMember		    
Weighted average strike price per Mmbtu/Bbl 3.95hrg_DerivativeSwapTypeAverageStrikePrice
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_NaturalGasCommodityContractMember
/ hrg_DerivativePeriodAxis
= hrg_RemainderOfYearOneMember		   3.95hrg_DerivativeSwapTypeAverageStrikePrice
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_NaturalGasCommodityContractMember
/ hrg_DerivativePeriodAxis
= hrg_RemainderOfYearOneMember		    
Fair Value at March 31, 2015 9.6us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_NaturalGasCommodityContractMember
/ hrg_DerivativePeriodAxis
= hrg_RemainderOfYearOneMember		   9.6us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_NaturalGasCommodityContractMember
/ hrg_DerivativePeriodAxis
= hrg_RemainderOfYearOneMember		    
Swap [Member] | Oil Commodity Contract [Member]          
Derivative [Line Items]          
Fair Value at March 31, 2015 8.9us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_OilCommodityContractMember		   8.9us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_OilCommodityContractMember		    
Derivative, Commodity Contract, Oil Volume 188,000hrg_DerivativeCommodityContractOilVolume
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_OilCommodityContractMember		   188,000hrg_DerivativeCommodityContractOilVolume
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_OilCommodityContractMember		   254,000hrg_DerivativeCommodityContractOilVolume
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_OilCommodityContractMember
Swap [Member] | Oil Commodity Contract [Member] | Year Two [Member]          
Derivative [Line Items]          
Weighted average strike price per Mmbtu/Bbl 94.98hrg_DerivativeSwapTypeAverageStrikePrice
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_OilCommodityContractMember
/ hrg_DerivativePeriodAxis
= hrg_YearTwoMember		   94.98hrg_DerivativeSwapTypeAverageStrikePrice
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_OilCommodityContractMember
/ hrg_DerivativePeriodAxis
= hrg_YearTwoMember		    
Fair Value at March 31, 2015 8.9us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_OilCommodityContractMember
/ hrg_DerivativePeriodAxis
= hrg_YearTwoMember		   8.9us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_OilCommodityContractMember
/ hrg_DerivativePeriodAxis
= hrg_YearTwoMember		    
Swap [Member] | Oil Commodity Contract [Member] | Remainder of 2014 [Member]          
Derivative [Line Items]          
Derivative, Commodity Contract, Oil Volume 188,000hrg_DerivativeCommodityContractOilVolume
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_OilCommodityContractMember
/ hrg_DerivativePeriodAxis
= hrg_RemainderOfYearOneMember		   188,000hrg_DerivativeCommodityContractOilVolume
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_OilCommodityContractMember
/ hrg_DerivativePeriodAxis
= hrg_RemainderOfYearOneMember		    
Swap [Member] | Energy Related Derivative [Member]          
Derivative [Line Items]          
Fair Value at March 31, 2015 19.3us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EnergyRelatedDerivativeMember		   19.3us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EnergyRelatedDerivativeMember		    
Commodity Option [Member] | Natural Gas Commodity Contract [Member] | Remainder of 2014 [Member]          
Derivative [Line Items]          
Natural Gas, Volume 4,280,000hrg_DerivativeCommodityContractEnergyVolume
/ us-gaap_DerivativeByNatureAxis
= us-gaap_CommodityOptionMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_NaturalGasCommodityContractMember
/ hrg_DerivativePeriodAxis
= hrg_RemainderOfYearOneMember		   4,280,000hrg_DerivativeCommodityContractEnergyVolume
/ us-gaap_DerivativeByNatureAxis
= us-gaap_CommodityOptionMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_NaturalGasCommodityContractMember
/ hrg_DerivativePeriodAxis
= hrg_RemainderOfYearOneMember		    
Fair Value at March 31, 2015 0.8us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_CommodityOptionMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_NaturalGasCommodityContractMember
/ hrg_DerivativePeriodAxis
= hrg_RemainderOfYearOneMember		   0.8us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_CommodityOptionMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_NaturalGasCommodityContractMember
/ hrg_DerivativePeriodAxis
= hrg_RemainderOfYearOneMember		    
Commodity Option [Member] | Natural Gas Commodity Contract- Short put [Member] | Remainder of 2014 [Member]          
Derivative [Line Items]          
Weighted average strike price per Mmbtu/Bbl 2.10hrg_DerivativeSwapTypeAverageStrikePrice
/ us-gaap_DerivativeByNatureAxis
= us-gaap_CommodityOptionMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_NaturalGasCommodityContractShortputMember
/ hrg_DerivativePeriodAxis
= hrg_RemainderOfYearOneMember		   2.10hrg_DerivativeSwapTypeAverageStrikePrice
/ us-gaap_DerivativeByNatureAxis
= us-gaap_CommodityOptionMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_NaturalGasCommodityContractShortputMember
/ hrg_DerivativePeriodAxis
= hrg_RemainderOfYearOneMember		    
Commodity Option [Member] | Natural Gas Commodity Option Contract- Short call [Member] [Member] | Remainder of 2014 [Member]          
Derivative [Line Items]          
Weighted average strike price per Mmbtu/Bbl 3.27hrg_DerivativeSwapTypeAverageStrikePrice
/ us-gaap_DerivativeByNatureAxis
= us-gaap_CommodityOptionMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_NaturalGasCommodityOptionContractShortcallMemberMember
/ hrg_DerivativePeriodAxis
= hrg_RemainderOfYearOneMember		   3.27hrg_DerivativeSwapTypeAverageStrikePrice
/ us-gaap_DerivativeByNatureAxis
= us-gaap_CommodityOptionMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_NaturalGasCommodityOptionContractShortcallMemberMember
/ hrg_DerivativePeriodAxis
= hrg_RemainderOfYearOneMember		    
Commodity Option [Member] | Natural Gas Commodity Commodity Contract- Long put [Member] | Remainder of 2014 [Member]          
Derivative [Line Items]          
Weighted average strike price per Mmbtu/Bbl 2.85hrg_DerivativeSwapTypeAverageStrikePrice
/ us-gaap_DerivativeByNatureAxis
= us-gaap_CommodityOptionMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_NaturalGasCommodityCommodityContractLongputMember
/ hrg_DerivativePeriodAxis
= hrg_RemainderOfYearOneMember		   2.85hrg_DerivativeSwapTypeAverageStrikePrice
/ us-gaap_DerivativeByNatureAxis
= us-gaap_CommodityOptionMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_NaturalGasCommodityCommodityContractLongputMember
/ hrg_DerivativePeriodAxis
= hrg_RemainderOfYearOneMember