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Acquisitions Acquisition - Ability Re (Details) (USD $)
0 Months Ended 3 Months Ended
Nov. 03, 2014
Dec. 31, 2014
Oct. 31, 2014
Ability Re [Member]      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities     $ 100,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities
/ us-gaap_BusinessAcquisitionAxis
= hrg_AbilityReMember
Payments to Acquire Businesses, Gross 17,900,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= hrg_AbilityReMember
   
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents     8,400,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= hrg_AbilityReMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Funds Withheld     359,500,000hrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedFundsWithheld
/ us-gaap_BusinessAcquisitionAxis
= hrg_AbilityReMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets     368,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= hrg_AbilityReMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Insurance Reserves     346,900,000hrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedInsuranceReserves
/ us-gaap_BusinessAcquisitionAxis
= hrg_AbilityReMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other     1,900,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= hrg_AbilityReMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities     348,800,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= hrg_AbilityReMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Assets Less Goodwill     19,200,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= hrg_AbilityReMember
Business Combination, Consideration Transferred   19,200,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= hrg_AbilityReMember
 
Shaser [Member]      
Business Acquisition [Line Items]      
Payments to Acquire Businesses, Gross   (1,500,000)us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= hrg_ShaserMember
 
Business Combination, Consideration Transferred, Other   $ 2,800,000us-gaap_BusinessCombinationConsiderationTransferredOther1
/ us-gaap_BusinessAcquisitionAxis
= hrg_ShaserMember