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Goodwill and Intangibles, including DAC and VOBA - Summary of Definite Lived Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Finite-Lived Intangible Assets [Line Items]    
Document Period End Date Dec. 31, 2014  
Cost $ 1,239.2us-gaap_FiniteLivedIntangibleAssetsGross 1,240.4us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization (341.2)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (323.2)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net 898.0us-gaap_FiniteLivedIntangibleAssetsNet 917.2us-gaap_FiniteLivedIntangibleAssetsNet
Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 1 year  
Maximum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 20 years  
Customer relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 876.3us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
877.1us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Accumulated Amortization (213.9)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
(204.6)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Net 662.4us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
672.5us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Customer relationships [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life   15 years
Customer relationships [Member] | Maximum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life   20 years
Trade names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 170.7us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
171.1us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Accumulated Amortization (65.0)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
(61.0)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Net 105.7us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
110.1us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Trade names [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life   1 year
Trade names [Member] | Maximum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life   12 years
Technology assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 192.2us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hrg_TechnologyAssetsMember
192.2us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hrg_TechnologyAssetsMember
Accumulated Amortization (62.3)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hrg_TechnologyAssetsMember
(57.6)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hrg_TechnologyAssetsMember
Net $ 129.9us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hrg_TechnologyAssetsMember
134.6us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hrg_TechnologyAssetsMember
Technology assets [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life   4 years
Technology assets [Member] | Maximum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life   17 years