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Acquisitions Acquisition - Ability Re (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 6 Months Ended
Nov. 03, 2014
Mar. 31, 2015
Oct. 31, 2014
Ability Re [Member]      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities     $ 0.1us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities
/ us-gaap_BusinessAcquisitionAxis
= hrg_AbilityReMember
Payments to Acquire Businesses, Gross 17.9us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= hrg_AbilityReMember
   
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents     8.4us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= hrg_AbilityReMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Funds Withheld     359.5hrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedFundsWithheld
/ us-gaap_BusinessAcquisitionAxis
= hrg_AbilityReMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets     368.0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= hrg_AbilityReMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Insurance Reserves     346.9hrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedInsuranceReserves
/ us-gaap_BusinessAcquisitionAxis
= hrg_AbilityReMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other     1.9us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= hrg_AbilityReMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities     348.8us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= hrg_AbilityReMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Assets Less Goodwill     19.2us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= hrg_AbilityReMember
Business Combination, Consideration Transferred 19.2us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= hrg_AbilityReMember
   
Shaser [Member]      
Business Acquisition [Line Items]      
Payments to Acquire Businesses, Gross   (1.5)us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= hrg_ShaserMember
 
Business Combination, Consideration Transferred, Other   $ 2.8us-gaap_BusinessCombinationConsiderationTransferredOther1
/ us-gaap_BusinessAcquisitionAxis
= hrg_ShaserMember