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Goodwill and Intangibles, including DAC and VOBA - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2014
Finite-Lived Intangible Assets [Line Items]      
Goodwill, Acquired During Period $ 7,100,000us-gaap_GoodwillAcquiredDuringPeriod    
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 77,500,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
Intangible assets amortization method straight-line method    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate  
Indefinite-lived Intangible Assets Acquired 4,000,000us-gaap_IndefinitelivedIntangibleAssetsAcquired    
Document Period End Date Dec. 31, 2014    
Goodwill and Intangible Asset Impairment (60,200,000)us-gaap_GoodwillAndIntangibleAssetImpairment    
Amortization of intangibles 31,800,000us-gaap_AmortizationOfIntangibleAssets 43,400,000us-gaap_AmortizationOfIntangibleAssets  
Finite-Lived Intangible Assets, Accumulated Amortization 341,200,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization   323,200,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
2014     80,700,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2015     80,700,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2016     80,700,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2017     80,700,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) (31,900,000)us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill    
Goodwill, Impairment Loss (28,300,000)us-gaap_GoodwillImpairmentLoss    
VOBA [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 32,900,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hrg_VobaMember
   
Cumulative adjustments for net unrealized investment gains (157,200,000)hrg_CumulativeAdjustmentsForNetUnrealizedInvestmentGains
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hrg_VobaMember
  (164,200,000)hrg_CumulativeAdjustmentsForNetUnrealizedInvestmentGains
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hrg_VobaMember
Amortization of intangibles 4,000,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hrg_VobaMember
13,200,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hrg_VobaMember
 
Finite-Lived Intangible Assets, Accumulated Amortization (342,400,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hrg_VobaMember
283,700,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hrg_VobaMember
 
2014 40,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hrg_VobaMember
   
2015 32,900,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hrg_VobaMember
   
2016 26,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hrg_VobaMember
   
2017 21,300,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hrg_VobaMember
   
DAC [Member]      
Finite-Lived Intangible Assets [Line Items]      
Cumulative adjustments for net unrealized investment gains (61,500,000)hrg_CumulativeAdjustmentsForNetUnrealizedInvestmentGains
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hrg_DacMember
  (55,500,000)hrg_CumulativeAdjustmentsForNetUnrealizedInvestmentGains
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hrg_DacMember
Amortization of intangibles 7,300,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hrg_DacMember
10,000,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hrg_DacMember
 
Deferred sales inducements, net of shadow adjustments 35,800,000hrg_DeferredSalesInducementsNetOfShadowAdjustments
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hrg_DacMember
  32,700,000hrg_DeferredSalesInducementsNetOfShadowAdjustments
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hrg_DacMember
Minimum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Accretion Rate, VOBA 4.00%hrg_AccretionRateVOBA
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Amortizable Life 1 year    
Maximum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Accretion Rate, VOBA 5.00%hrg_AccretionRateVOBA
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Amortizable Life 20 years    
Weighted Average [Member] | VOBA [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortizable Life 4 years 10 months 24 days    
FOH [Member] | Trademarks and Trade Names [Member]      
Finite-Lived Intangible Assets [Line Items]      
Goodwill, Acquired During Period     16,200,000.000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
/ dei_LegalEntityAxis
= hrg_FOHMember
Indefinite-lived Intangible Assets Acquired $ 9,900,000.000us-gaap_IndefinitelivedIntangibleAssetsAcquired
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
/ dei_LegalEntityAxis
= hrg_FOHMember