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Basis of Presentation, Significant Accounting Polices and Practicies and Recent Accounting Pronouncements - Basis of Presentation (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Basis of Presentation [Line Items]      
Asset Impairment Charges   $ 250.2us-gaap_AssetImpairmentCharges  
Document Period End Date Dec. 31, 2014    
Unamortized costs exceed ceiling limitations 190.0us-gaap_UnamortizedCostsCapitalizedLessRelatedDeferredIncomeTaxesExceedCeilingLimitationExpense    
FGL [Member]      
Basis of Presentation [Line Items]      
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 19.90%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= hrg_FglMember
   
Raven Re [Member]      
Basis of Presentation [Line Items]      
Statutory Accounting Practices, Statutory Capital and Surplus, Balance 245.0us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance
/ dei_LegalEntityAxis
= hrg_RavenReMember
  270.0us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance
/ dei_LegalEntityAxis
= hrg_RavenReMember
Statutory Accounting Practices, Permitted Practice, Change in Statutory Capital and Surplus 17.3hrg_StatutoryAccountingPracticesPermittedPracticeChangeinStatutoryCapitalandSurplus
/ dei_LegalEntityAxis
= hrg_RavenReMember
  20.5hrg_StatutoryAccountingPracticesPermittedPracticeChangeinStatutoryCapitalandSurplus
/ dei_LegalEntityAxis
= hrg_RavenReMember
Statutory Accounting Practices, Non-Permitted Practice, Change in Statutory Capital and Surplus (75.1)hrg_StatutoryAccountingPracticesNonPermittedPracticeChangeinStatutoryCapitalandSurplus
/ dei_LegalEntityAxis
= hrg_RavenReMember
  (108.9)hrg_StatutoryAccountingPracticesNonPermittedPracticeChangeinStatutoryCapitalandSurplus
/ dei_LegalEntityAxis
= hrg_RavenReMember
Energy Segment [Member]      
Basis of Presentation [Line Items]      
Asset Impairment Charges   $ 190.0us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= hrg_EnergySegmentMember