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Acquisitions Acquisition - Salix (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended
Mar. 31, 2015
Jan. 16, 2015
Dec. 31, 2014
Mar. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]          
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate        
Salix Animal Health LLC [Member]          
Business Acquisition [Line Items]          
Acquired Technology Assets   $ 2.1hrg_AcquiredTechnologyAssets
/ us-gaap_BusinessAcquisitionAxis
= hrg_SalixAnimalHealthLLCMember
     
European IAMS and Eukanuba [Member]          
Business Acquisition [Line Items]          
Acquired Technology Assets     3.6hrg_AcquiredTechnologyAssets
/ us-gaap_BusinessAcquisitionAxis
= hrg_EuropeanIAMSandEukanubaMember
  3.6hrg_AcquiredTechnologyAssets
/ us-gaap_BusinessAcquisitionAxis
= hrg_EuropeanIAMSandEukanubaMember
Trade Names [Member] | Salix Animal Health LLC [Member]          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   20.0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= hrg_SalixAnimalHealthLLCMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
     
Acquired Finite-lived Intangible Asset, Residual Value   1.0us-gaap_AcquiredFiniteLivedIntangibleAssetResidualValue
/ us-gaap_BusinessAcquisitionAxis
= hrg_SalixAnimalHealthLLCMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
     
Trade Names [Member] | European IAMS and Eukanuba [Member]          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles     26.7us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= hrg_EuropeanIAMSandEukanubaMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
  26.7us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= hrg_EuropeanIAMSandEukanubaMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Customer Relationships [Member] | Salix Animal Health LLC [Member]          
Business Acquisition [Line Items]          
Acquired Finite-lived Intangible Asset, Residual Value   34.0us-gaap_AcquiredFiniteLivedIntangibleAssetResidualValue
/ us-gaap_BusinessAcquisitionAxis
= hrg_SalixAnimalHealthLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
     
Finite-Lived Intangible Asset, Useful Life   13 years      
Retention Rate   92.50%hrg_RetentionRate
/ us-gaap_BusinessAcquisitionAxis
= hrg_SalixAnimalHealthLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
     
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   38.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ us-gaap_BusinessAcquisitionAxis
= hrg_SalixAnimalHealthLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
     
Customer Relationships [Member] | European IAMS and Eukanuba [Member]          
Business Acquisition [Line Items]          
Acquired Finite-lived Intangible Asset, Residual Value     10.2us-gaap_AcquiredFiniteLivedIntangibleAssetResidualValue
/ us-gaap_BusinessAcquisitionAxis
= hrg_EuropeanIAMSandEukanubaMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  10.2us-gaap_AcquiredFiniteLivedIntangibleAssetResidualValue
/ us-gaap_BusinessAcquisitionAxis
= hrg_EuropeanIAMSandEukanubaMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ us-gaap_BusinessAcquisitionAxis
= hrg_EuropeanIAMSandEukanubaMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
   
Trade Names [Member] | Salix Animal Health LLC [Member]          
Business Acquisition [Line Items]          
Finite-Lived Intangible Asset, Useful Life   13 years      
Non-Compete Agreement [Member] | Salix Animal Health LLC [Member]          
Business Acquisition [Line Items]          
Acquired Finite-lived Intangible Asset, Residual Value   $ 1.4us-gaap_AcquiredFiniteLivedIntangibleAssetResidualValue
/ us-gaap_BusinessAcquisitionAxis
= hrg_SalixAnimalHealthLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hrg_NonCompeteAgreementMember
     
Finite-Lived Intangible Asset, Useful Life   3 years      
Minimum [Member]          
Business Acquisition [Line Items]          
Finite-Lived Intangible Asset, Useful Life       1 year  
Minimum [Member] | Customer Relationships [Member]          
Business Acquisition [Line Items]          
Finite-Lived Intangible Asset, Useful Life       15 years  
Minimum [Member] | Customer Relationships [Member] | Salix Animal Health LLC [Member]          
Business Acquisition [Line Items]          
Fair Value Inputs, Long-term Revenue Growth Rate   0.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ us-gaap_BusinessAcquisitionAxis
= hrg_SalixAnimalHealthLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Business Acquisition Contingent Consideration Key Assumptions Discount Rate   12.00%hrg_BusinessAcquisitionContingentConsiderationKeyAssumptionsDiscountRate
/ us-gaap_BusinessAcquisitionAxis
= hrg_SalixAnimalHealthLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Minimum [Member] | Customer Relationships [Member] | European IAMS and Eukanuba [Member]          
Business Acquisition [Line Items]          
Finite-Lived Intangible Asset, Useful Life     2 years    
Fair Value Inputs, Long-term Revenue Growth Rate         0.50%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ us-gaap_BusinessAcquisitionAxis
= hrg_EuropeanIAMSandEukanubaMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Retention Rate     90.00%hrg_RetentionRate
/ us-gaap_BusinessAcquisitionAxis
= hrg_EuropeanIAMSandEukanubaMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
  90.00%hrg_RetentionRate
/ us-gaap_BusinessAcquisitionAxis
= hrg_EuropeanIAMSandEukanubaMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Business Acquisition Contingent Consideration Key Assumptions Discount Rate       15.00%hrg_BusinessAcquisitionContingentConsiderationKeyAssumptionsDiscountRate
/ us-gaap_BusinessAcquisitionAxis
= hrg_EuropeanIAMSandEukanubaMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Minimum [Member] | Trade Names [Member]          
Business Acquisition [Line Items]          
Finite-Lived Intangible Asset, Useful Life       1 year  
Maximum [Member]          
Business Acquisition [Line Items]          
Finite-Lived Intangible Asset, Useful Life       20 years  
Maximum [Member] | Customer Relationships [Member]          
Business Acquisition [Line Items]          
Finite-Lived Intangible Asset, Useful Life       20 years  
Maximum [Member] | Customer Relationships [Member] | Salix Animal Health LLC [Member]          
Business Acquisition [Line Items]          
Fair Value Inputs, Long-term Revenue Growth Rate   12.10%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ us-gaap_BusinessAcquisitionAxis
= hrg_SalixAnimalHealthLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Business Acquisition Contingent Consideration Key Assumptions Discount Rate   13.00%hrg_BusinessAcquisitionContingentConsiderationKeyAssumptionsDiscountRate
/ us-gaap_BusinessAcquisitionAxis
= hrg_SalixAnimalHealthLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Maximum [Member] | Customer Relationships [Member] | European IAMS and Eukanuba [Member]          
Business Acquisition [Line Items]          
Finite-Lived Intangible Asset, Useful Life     15 years    
Fair Value Inputs, Long-term Revenue Growth Rate         13.20%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ us-gaap_BusinessAcquisitionAxis
= hrg_EuropeanIAMSandEukanubaMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Retention Rate     100.00%hrg_RetentionRate
/ us-gaap_BusinessAcquisitionAxis
= hrg_EuropeanIAMSandEukanubaMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
  100.00%hrg_RetentionRate
/ us-gaap_BusinessAcquisitionAxis
= hrg_EuropeanIAMSandEukanubaMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Business Acquisition Contingent Consideration Key Assumptions Discount Rate       16.00%hrg_BusinessAcquisitionContingentConsiderationKeyAssumptionsDiscountRate
/ us-gaap_BusinessAcquisitionAxis
= hrg_EuropeanIAMSandEukanubaMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Maximum [Member] | Trade Names [Member]          
Business Acquisition [Line Items]          
Finite-Lived Intangible Asset, Useful Life       12 years