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Investments - Available-for-Sale Securities (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
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Sep. 30, 2012
Schedule of Investments [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 1,222.9us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue $ 755.6us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue $ 1,222.9us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue $ 755.6us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue $ 1,160.8us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue $ 1,066.0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue $ 709.5us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue $ 523.5us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue  
Total Gains (Losses) Included in Earnings 8.4us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1   8.9us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 0.6us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1          
Total investments, Carrying Value 19,752.6hrg_AvailableForSaleSecuritiesCarryingValue   19,752.6hrg_AvailableForSaleSecuritiesCarryingValue     19,252.5hrg_AvailableForSaleSecuritiesCarryingValue      
Available-for-sale Debt Securities, Amortized Cost Basis 16,917.2us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis   16,917.2us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis            
Total investments, Cost or Amortized Cost 18,757.2hrg_UnrealizedAmortizedCostOnSecurities   18,757.2hrg_UnrealizedAmortizedCostOnSecurities     18,409.8hrg_UnrealizedAmortizedCostOnSecurities      
Investments, Unrealized Losses (195.3)hrg_InvestmentsUnrealizedLosses   (195.3)hrg_InvestmentsUnrealizedLosses     (158.4)hrg_InvestmentsUnrealizedLosses      
Investments, Unrealized Gains 1,190.7hrg_InvestmentsUnrealizedGains   1,190.7hrg_InvestmentsUnrealizedGains     1,001.1hrg_InvestmentsUnrealizedGains      
Total investment, Estimated Fair Value 19,752.6hrg_AvailableForSaleSecuritiesFairValue   19,752.6hrg_AvailableForSaleSecuritiesFairValue     19,252.5hrg_AvailableForSaleSecuritiesFairValue      
Total Gains (Losses) Included in AOCI 17.3us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss 11.3us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss 28.4us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss 4.6us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss          
Purchases 94.6us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases 41.7us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases 186.8us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases 234.3us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 30.6us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements 1.9us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements 33.7us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements 2.4us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements          
Net transfer In (Out) of Level 3 (a) (27.6)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet [1] (5.0)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet [2] (33.5)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet [3] (5.0)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet [4]          
Asset-backed Securities [Member]                  
Schedule of Investments [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 34.3us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
10.7us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
34.3us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
10.7us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
34.6us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
37.0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
9.8us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
5.0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
 
Total Gains (Losses) Included in Earnings 0.1us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
  0.1us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
           
Total Gains (Losses) Included in AOCI 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
(0.1)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
(0.3)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
         
Purchases 3.2us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
  6.7us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
5.0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
         
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0.1us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
  0.1us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
           
Net transfer In (Out) of Level 3 (a) (3.5)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
[1] 1.0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
[2] (9.4)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
[3] 1.0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
[4]          
Commercial Mortgage Backed Securities [Member]                  
Schedule of Investments [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 142.5us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
  142.5us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
  120.4us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
83.1us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
6.0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
5.7us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
 
Total Gains (Losses) Included in AOCI 1.5us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
  2.3us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
0.3us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
         
Purchases 20.9us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
  57.7us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
           
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0.3us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
  0.6us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
           
Net transfer In (Out) of Level 3 (a)   (6.0)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
[2]   (6.0)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
[4]          
Corporate Debt Securities [Member]                  
Schedule of Investments [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 941.1us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
657.0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
941.1us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
657.0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
907.6us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
850.0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
607.1us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
461.1us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Total Gains (Losses) Included in Earnings 2.4us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
  2.3us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
           
Total Gains (Losses) Included in AOCI 14.9us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
10.1us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
23.3us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
4.0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
         
Purchases 70.5us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
41.7us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
122.4us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
194.3us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
         
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
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  0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
           
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 30.2us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
1.9us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
32.8us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
2.4us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
         
Net transfer In (Out) of Level 3 (a) (24.1)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
[1]   (24.1)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
[3]            
Hybrids [Member]                  
Schedule of Investments [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   35.6us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_HybridsMember
  35.6us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_HybridsMember
    34.3us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_HybridsMember
   
Total Gains (Losses) Included in AOCI   1.3us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_HybridsMember
  0.6us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_HybridsMember
         
Purchases       35.0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_HybridsMember
         
Municipals [Member]                  
Schedule of Investments [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 39.8us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
  39.8us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
  38.8us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
37.2us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
     
Total Gains (Losses) Included in Earnings 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
  0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
           
Total Gains (Losses) Included in AOCI 1.0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
  2.8us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
           
Purchases 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
  0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
           
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
  0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
           
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
  0.2us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
           
Net transfer In (Out) of Level 3 (a) 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
[1]   0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
[3]            
Non Agency Residential Mortgage Backed Securities [Member]                  
Schedule of Investments [Line Items]                  
Unrealized gains included in AOCI related to the non-credit portion of other than-temporary impairments on non-agency residential-mortgage-backed securities 0.9hrg_UnrealizedGainRelatedToNonCreditPortionOfOtherThanTemporaryImpairmentsIncludedInAccumulatedOtherComprehensiveIncome
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_NonAgencyResidentialMortgageBackedSecuritiesMember
  0.9hrg_UnrealizedGainRelatedToNonCreditPortionOfOtherThanTemporaryImpairmentsIncludedInAccumulatedOtherComprehensiveIncome
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_NonAgencyResidentialMortgageBackedSecuritiesMember
           
Unrealized losses included in AOCI related to the non-credit portion of other than-temporary impairments on non-agency residential-mortgage-backed securities (1.9)hrg_UnrealizedLossesRelatedToNonCreditPortionOfOtherThanTemporaryImpairmentsIncludedInAccumulatedOtherComprehensiveIncome
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_NonAgencyResidentialMortgageBackedSecuritiesMember
  (1.9)hrg_UnrealizedLossesRelatedToNonCreditPortionOfOtherThanTemporaryImpairmentsIncludedInAccumulatedOtherComprehensiveIncome
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_NonAgencyResidentialMortgageBackedSecuritiesMember
           
Other Marketable Securities, Current 15,985.6us-gaap_OtherMarketableSecuritiesCurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_NonAgencyResidentialMortgageBackedSecuritiesMember
  15,985.6us-gaap_OtherMarketableSecuritiesCurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_NonAgencyResidentialMortgageBackedSecuritiesMember
          15,009.3us-gaap_OtherMarketableSecuritiesCurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_NonAgencyResidentialMortgageBackedSecuritiesMember
Equity Securities [Member]                  
Schedule of Investments [Line Items]                  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 6.0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
10.8us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
6.0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
10.8us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
6.1us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
6.0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
10.8us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
10.7us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
 
Total Gains (Losses) Included in Earnings   0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
  0.1us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
         
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 76.5us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
  76.5us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
    31.2us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
     
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax (37.8)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
  (37.8)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
    (50.0)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
     
Available-for-sale Securities, Equity Securities 671.7us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
  671.7us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
    768.1us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
     
Total investments, Carrying Value 671.7hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
  671.7hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
    768.1hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
     
Available-for-sale Equity Securities, Amortized Cost Basis 633.0us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
  633.0us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
    786.9us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
     
Total Gains (Losses) Included in AOCI (0.1)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
         
Purchases 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
         
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
         
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
         
Net transfer In (Out) of Level 3 (a) 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
[1] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
[2] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
[3] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
[4]          
Equity Securities [Member] | Available-for-sale [Member]                  
Schedule of Investments [Line Items]                  
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 34.7us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
  34.7us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
    23.0us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
     
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax (2.9)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
  (2.9)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
    (5.1)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
     
Available-for-sale Securities, Equity Securities 593.9us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
  593.9us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
    663.6us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
     
Total investments, Carrying Value 593.9hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
  593.9hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
    663.6hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
     
Available-for-sale Equity Securities, Amortized Cost Basis 562.1us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
  562.1us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
    645.7us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
     
Equity Securities [Member] | Held for trading [Member]                  
Schedule of Investments [Line Items]                  
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 41.8us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesClassifiedAsHeldForTradingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
  41.8us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesClassifiedAsHeldForTradingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
    8.2us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesClassifiedAsHeldForTradingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
     
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax (34.9)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesClassifiedAsHeldForTradingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
  (34.9)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesClassifiedAsHeldForTradingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
    (44.9)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesClassifiedAsHeldForTradingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
     
Available-for-sale Securities, Equity Securities 77.8us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesClassifiedAsHeldForTradingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
  77.8us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesClassifiedAsHeldForTradingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
    104.5us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesClassifiedAsHeldForTradingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
     
Total investments, Carrying Value 77.8hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesClassifiedAsHeldForTradingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
  77.8hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesClassifiedAsHeldForTradingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
    104.5hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesClassifiedAsHeldForTradingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
     
Available-for-sale Equity Securities, Amortized Cost Basis 70.9us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesClassifiedAsHeldForTradingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
  70.9us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesClassifiedAsHeldForTradingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
    141.2us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_FinancialInstrumentAxis
= hrg_EquitySecuritiesClassifiedAsHeldForTradingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
     
Fixed-maturity securities, available-for-sale [Member]                  
Schedule of Investments [Line Items]                  
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 1,030.6us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
  1,030.6us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
    846.5us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
     
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (137.2)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
  (137.2)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
    (103.7)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
     
Available-for-sale Securities, Debt Securities 17,810.6us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
  17,810.6us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
    17,211.5us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
     
Total investments, Carrying Value 17,810.6hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
  17,810.6hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
    17,211.5hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
     
Available-for-sale Debt Securities, Amortized Cost Basis 16,917.2us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
  16,917.2us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
    16,468.7us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
     
Fixed-maturity securities, available-for-sale [Member] | Asset-backed Securities [Member]                  
Schedule of Investments [Line Items]                  
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 10.1us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
  10.1us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
    10.9us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
     
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (18.5)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
  (18.5)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
    (18.8)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
     
Available-for-sale Securities, Debt Securities 1,931.2us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
  1,931.2us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
    1,792.9us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
     
Total investments, Carrying Value 1,931.2hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
  1,931.2hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
    1,792.9hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
     
Available-for-sale Debt Securities, Amortized Cost Basis 1,939.6us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
  1,939.6us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
    1,800.8us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
     
Fixed-maturity securities, available-for-sale [Member] | Commercial Mortgage Backed Securities [Member]                  
Schedule of Investments [Line Items]                  
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 22.9us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
  22.9us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
    21.3us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
     
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (0.8)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
  (0.8)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
    (2.0)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
     
Available-for-sale Securities, Debt Securities 729.3us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
  729.3us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
    636.9us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
     
Total investments, Carrying Value 729.3hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
  729.3hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
    636.9hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
     
Available-for-sale Debt Securities, Amortized Cost Basis 707.2us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
  707.2us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
    617.6us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
     
Fixed-maturity securities, available-for-sale [Member] | Corporate Debt Securities [Member]                  
Schedule of Investments [Line Items]                  
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 647.5us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
  647.5us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
    499.2us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
     
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (74.6)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
  (74.6)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
    (48.9)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
     
Available-for-sale Securities, Debt Securities 9,843.1us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
  9,843.1us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
    9,795.8us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
     
Total investments, Carrying Value 9,843.1hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
  9,843.1hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
    9,795.8hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
     
Available-for-sale Debt Securities, Amortized Cost Basis 9,270.2us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
  9,270.2us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
    9,345.5us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
     
Fixed-maturity securities, available-for-sale [Member] | Hybrids [Member]                  
Schedule of Investments [Line Items]                  
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 74.0us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_HybridsMember
  74.0us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_HybridsMember
    52.2us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_HybridsMember
     
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (19.6)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_HybridsMember
  (19.6)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_HybridsMember
    (15.2)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_HybridsMember
     
Available-for-sale Securities, Debt Securities 1,357.3us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_HybridsMember
  1,357.3us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_HybridsMember
    1,316.1us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_HybridsMember
     
Total investments, Carrying Value 1,357.3hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_HybridsMember
  1,357.3hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_HybridsMember
    1,316.1hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_HybridsMember
     
Available-for-sale Debt Securities, Amortized Cost Basis 1,302.9us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_HybridsMember
  1,302.9us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_HybridsMember
    1,279.1us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_HybridsMember
     
Fixed-maturity securities, available-for-sale [Member] | Municipals [Member]                  
Schedule of Investments [Line Items]                  
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 156.7us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
  156.7us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
    116.2us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
     
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (1.8)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
  (1.8)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
    (6.3)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
     
Available-for-sale Securities, Debt Securities 1,435.6us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
  1,435.6us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
    1,259.8us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
     
Total investments, Carrying Value 1,435.6hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
  1,435.6hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
    1,259.8hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
     
Available-for-sale Debt Securities, Amortized Cost Basis 1,280.7us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
  1,280.7us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
    1,149.9us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember
     
Fixed-maturity securities, available-for-sale [Member] | Agency residential mortgage-backed securities [Member]                  
Schedule of Investments [Line Items]                  
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 108.3us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_AgencyResidentialMortgageBackedSecuritiesMember
  108.3us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_AgencyResidentialMortgageBackedSecuritiesMember
    140.3us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_AgencyResidentialMortgageBackedSecuritiesMember
     
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (21.8)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_AgencyResidentialMortgageBackedSecuritiesMember
  (21.8)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_AgencyResidentialMortgageBackedSecuritiesMember
    (11.1)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_AgencyResidentialMortgageBackedSecuritiesMember
     
Available-for-sale Securities, Debt Securities 2,194.3us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_AgencyResidentialMortgageBackedSecuritiesMember
  2,194.3us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_AgencyResidentialMortgageBackedSecuritiesMember
    2,114.0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_AgencyResidentialMortgageBackedSecuritiesMember
     
Total investments, Carrying Value 2,194.3hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_AgencyResidentialMortgageBackedSecuritiesMember
  2,194.3hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_AgencyResidentialMortgageBackedSecuritiesMember
    2,114.0hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_AgencyResidentialMortgageBackedSecuritiesMember
     
Available-for-sale Debt Securities, Amortized Cost Basis 2,107.8us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_AgencyResidentialMortgageBackedSecuritiesMember
  2,107.8us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_AgencyResidentialMortgageBackedSecuritiesMember
    1,984.8us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_AgencyResidentialMortgageBackedSecuritiesMember
     
Fixed-maturity securities, available-for-sale [Member] | U.S. Government securities [Member]                  
Schedule of Investments [Line Items]                  
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 11.1us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
  11.1us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
    6.4us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
     
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (0.1)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
  (0.1)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
    (1.4)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
     
Available-for-sale Securities, Debt Securities 319.8us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
  319.8us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
    296.0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
     
Total investments, Carrying Value 319.8hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
  319.8hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
    296.0hrg_AvailableForSaleSecuritiesCarryingValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
     
Available-for-sale Debt Securities, Amortized Cost Basis 308.8us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
  308.8us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
    291.0us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
     
Derivative Financial Instruments, Assets [Member]                  
Schedule of Investments [Line Items]                  
Trading Securities, Cost 205.0us-gaap_TradingSecuritiesCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
  205.0us-gaap_TradingSecuritiesCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
    177.7us-gaap_TradingSecuritiesCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
     
Trading Securities 268.3us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
  268.3us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
    296.3us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
     
Other Investments Gross Unrealized Gain 83.6hrg_OtherInvestmentsGrossUnrealizedGain
/ us-gaap_InvestmentTypeAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
  83.6hrg_OtherInvestmentsGrossUnrealizedGain
/ us-gaap_InvestmentTypeAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
    123.3hrg_OtherInvestmentsGrossUnrealizedGain
/ us-gaap_InvestmentTypeAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
     
Other Short Term Investments Gross Unrealized Losses (20.3)hrg_OtherShortTermInvestmentsGrossUnrealizedLosses
/ us-gaap_InvestmentTypeAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
  (20.3)hrg_OtherShortTermInvestmentsGrossUnrealizedLosses
/ us-gaap_InvestmentTypeAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
    (4.7)hrg_OtherShortTermInvestmentsGrossUnrealizedLosses
/ us-gaap_InvestmentTypeAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
     
Asset based loan receivables [Member]                  
Schedule of Investments [Line Items]                  
Trading Securities, Cost 660.2us-gaap_TradingSecuritiesCost
/ us-gaap_InvestmentTypeAxis
= hrg_AssetbasedloanreceivablesMember
  660.2us-gaap_TradingSecuritiesCost
/ us-gaap_InvestmentTypeAxis
= hrg_AssetbasedloanreceivablesMember
    811.6us-gaap_TradingSecuritiesCost
/ us-gaap_InvestmentTypeAxis
= hrg_AssetbasedloanreceivablesMember
     
Trading Securities 660.2us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= hrg_AssetbasedloanreceivablesMember
  660.2us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= hrg_AssetbasedloanreceivablesMember
    811.6us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= hrg_AssetbasedloanreceivablesMember
     
Other Invested Assets [Member]                  
Schedule of Investments [Line Items]                  
Trading Securities, Cost           164.9us-gaap_TradingSecuritiesCost
/ us-gaap_InvestmentTypeAxis
= hrg_OtherInvestedAssetsMember
     
Trading Securities           165.0us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= hrg_OtherInvestedAssetsMember
     
Other Investments Gross Unrealized Gain           0.1hrg_OtherInvestmentsGrossUnrealizedGain
/ us-gaap_InvestmentTypeAxis
= hrg_OtherInvestedAssetsMember
     
Other Invested Assets [Member] | Other Investments Asset [Member] | All Other Securities [Member]                  
Schedule of Investments [Line Items]                  
Trading Securities, Cost 341.8us-gaap_TradingSecuritiesCost
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_OtherInvestmentsAssetMember
/ us-gaap_InvestmentTypeAxis
= hrg_OtherInvestedAssetsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_AllOtherSecuritiesMember
  341.8us-gaap_TradingSecuritiesCost
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_OtherInvestmentsAssetMember
/ us-gaap_InvestmentTypeAxis
= hrg_OtherInvestedAssetsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_AllOtherSecuritiesMember
           
Trading Securities 341.8us-gaap_TradingSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_OtherInvestmentsAssetMember
/ us-gaap_InvestmentTypeAxis
= hrg_OtherInvestedAssetsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_AllOtherSecuritiesMember
  341.8us-gaap_TradingSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_OtherInvestmentsAssetMember
/ us-gaap_InvestmentTypeAxis
= hrg_OtherInvestedAssetsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_AllOtherSecuritiesMember
           
Other Investments Gross Unrealized Gain 0hrg_OtherInvestmentsGrossUnrealizedGain
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_OtherInvestmentsAssetMember
/ us-gaap_InvestmentTypeAxis
= hrg_OtherInvestedAssetsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_AllOtherSecuritiesMember
  0hrg_OtherInvestmentsGrossUnrealizedGain
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_OtherInvestmentsAssetMember
/ us-gaap_InvestmentTypeAxis
= hrg_OtherInvestedAssetsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_AllOtherSecuritiesMember
           
Other Short Term Investments Gross Unrealized Losses $ 0hrg_OtherShortTermInvestmentsGrossUnrealizedLosses
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_OtherInvestmentsAssetMember
/ us-gaap_InvestmentTypeAxis
= hrg_OtherInvestedAssetsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_AllOtherSecuritiesMember
  $ 0hrg_OtherShortTermInvestmentsGrossUnrealizedLosses
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_OtherInvestmentsAssetMember
/ us-gaap_InvestmentTypeAxis
= hrg_OtherInvestedAssetsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_AllOtherSecuritiesMember
           
[1] (a) The net transfers out of Level 3 during the three months ended March 31, 2015 were exclusively to Level 2.
[2] (a) The net transfers out of Level 3 during the three months ended March 31, 2014 were exclusively to Level 2. There was a $6.0 transfer to asset-backed securities from commercial mortgage-backed securities
[3] (a) The net transfers out of Level 3 during the six months ended March 31, 2015 were exclusively to Level 2.
[4] (a) The net transfers out of Level 3 during the six months ended March 31, 2015 were exclusively to Level 2. There was a $6.0 transfer to asset-backed securities from commercial mortgage-backed securities