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Goodwill and Intangibles, including DAC and VOBA - Summary of Changes in Carrying Amounts of Goodwill and Intangible Assets Including FGL's DAC and VOBA Balances (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
Intangible Assets, Including Goodwill [Roll Forward] |  |  |  |
Beginning Balance, Goodwill |  |  | $ 1,524.8 us-gaap_Goodwill |
Beginning Balance, Indefinite Lived Intangible Assets |  |  | 1,215.9 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill |
Beginning Balance, Finite Lived Intangible Assets |  |  | 917.2 us-gaap_FiniteLivedIntangibleAssetsNet |
Beginning Balance, Intangible Assets, Excluding Goodwill |  |  | 2,683.7 us-gaap_IntangibleAssetsNetExcludingGoodwill |
Goodwill, Acquired During Period |  |  | 77.6 us-gaap_GoodwillAcquiredDuringPeriod |
Indefinite-lived Intangible Assets Acquired |  |  | 50.7 us-gaap_IndefinitelivedIntangibleAssetsAcquired |
Acquisitions (Note 13) |  |  | 112.4 hrg_IntangibleAssetsAcquiredDuringPeriod |
Goodwill, Impairment Loss |  |  | (28.3)us-gaap_GoodwillImpairmentLoss |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  |  | (31.9)us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill |
Impairment of Intangible Assets, Finite-lived |  |  | 60.2 us-gaap_ImpairmentOfIntangibleAssetsFinitelived | 0 us-gaap_ImpairmentOfIntangibleAssetsFinitelived
Goodwill and Intangible Asset Impairment |  |  | (31.9)us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill |
Deferrals |  |  | 176.5 hrg_Deferrals |
Less: Components of amortization: |  |  |  |
Amortization of intangibles | (18.2)us-gaap_AmortizationOfIntangibleAssets | (37.4)us-gaap_AmortizationOfIntangibleAssets | (50.0)us-gaap_AmortizationOfIntangibleAssets | (80.8)us-gaap_AmortizationOfIntangibleAssets
Adjustment for unrealized investment (gains), net, Goodwill |  |  | (70.0)hrg_AdjustmentForChangeInUnrealizedInvestmentLossesGainsNet |
Effect of translation, Intangible Assets Excluding Goodwill |  |  | (53.4)hrg_IntangibleAssetsTranslationAdjustments |
Ending Balance, Goodwill | 1,543.0 us-gaap_Goodwill |  | 1,543.0 us-gaap_Goodwill |
Ending Balance, Indefinite Lived Intangible Assets | 1,203.6 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill |  | 1,203.6 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill |
Ending Balance, Finite Lived Intangible Assets | 914.9 us-gaap_FiniteLivedIntangibleAssetsNet |  | 914.9 us-gaap_FiniteLivedIntangibleAssetsNet |
Ending Balance, Intangible Assets, Excluding Goodwill | 2,767.3 us-gaap_IntangibleAssetsNetExcludingGoodwill |  | 2,767.3 us-gaap_IntangibleAssetsNetExcludingGoodwill |
Unlocking [Member] |  |  |  |
Less: Components of amortization: |  |  |  |
Amortization of intangibles |  |  | (8.0)us-gaap_AmortizationOfIntangibleAssets / hrg_ComponentsofamortizationexpenseAxis = hrg_UnlockingMember |
Interest [Member] |  |  |  |
Less: Components of amortization: |  |  |  |
Amortization of intangibles |  |  | 16.8 us-gaap_AmortizationOfIntangibleAssets / hrg_ComponentsofamortizationexpenseAxis = hrg_InterestMember |
Periodic amortization [Member] |  |  |  |
Less: Components of amortization: |  |  |  |
Amortization of intangibles |  |  | (58.8)us-gaap_AmortizationOfIntangibleAssets / hrg_ComponentsofamortizationexpenseAxis = hrg_PeriodicAmortizationMember |
Definite Lived Intangible Assets [Member] |  |  |  |
Intangible Assets, Including Goodwill [Roll Forward] |  |  |  |
Beginning Balance, Finite Lived Intangible Assets |  |  | 917.2 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FiniteLivedIntangibleAssetsMember |
Acquisitions (Note 3), Finite-Lived Intangible Assets |  |  | 61.7 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FiniteLivedIntangibleAssetsMember |
Impairment of Intangible Assets, Finite-lived |  |  | 0 us-gaap_ImpairmentOfIntangibleAssetsFinitelived / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FiniteLivedIntangibleAssetsMember |
Less: Components of amortization: |  |  |  |
Amortization of intangibles | (21.2)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FiniteLivedIntangibleAssetsMember | (20.5)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FiniteLivedIntangibleAssetsMember | (41.7)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FiniteLivedIntangibleAssetsMember | (40.7)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FiniteLivedIntangibleAssetsMember
Effect of translation, Finite Lived intangible assets |  |  | (22.3)us-gaap_FiniteLivedIntangibleAssetsTranslationAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FiniteLivedIntangibleAssetsMember |
Ending Balance, Finite Lived Intangible Assets | 914.9 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FiniteLivedIntangibleAssetsMember |  | 914.9 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FiniteLivedIntangibleAssetsMember |
Definite Lived Intangible Assets [Member] | Periodic amortization [Member] |  |  |  |
Less: Components of amortization: |  |  |  |
Amortization of intangibles |  |  | (41.7)us-gaap_AmortizationOfIntangibleAssets / hrg_ComponentsofamortizationexpenseAxis = hrg_PeriodicAmortizationMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FiniteLivedIntangibleAssetsMember |
VOBA [Member] |  |  |  |
Intangible Assets, Including Goodwill [Roll Forward] |  |  |  |
Beginning Balance, Finite Lived Intangible Assets |  |  | 86.8 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hrg_VobaMember |
Less: Components of amortization: |  |  |  |
Amortization of intangibles | (10.0)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hrg_VobaMember | (10.9)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hrg_VobaMember | (14.0)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hrg_VobaMember | (24.1)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hrg_VobaMember
Adjustment for unrealized investment (gains), net, Goodwill |  |  | (17.8)hrg_AdjustmentForChangeInUnrealizedInvestmentLossesGainsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hrg_VobaMember |
Ending Balance, Finite Lived Intangible Assets | 55.0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hrg_VobaMember |  | 55.0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hrg_VobaMember |
VOBA [Member] | Unlocking [Member] |  |  |  |
Less: Components of amortization: |  |  |  |
Amortization of intangibles |  |  | 0.1 us-gaap_AmortizationOfIntangibleAssets / hrg_ComponentsofamortizationexpenseAxis = hrg_UnlockingMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hrg_VobaMember |
VOBA [Member] | Interest [Member] |  |  |  |
Less: Components of amortization: |  |  |  |
Amortization of intangibles |  |  | 6.1 us-gaap_AmortizationOfIntangibleAssets / hrg_ComponentsofamortizationexpenseAxis = hrg_InterestMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hrg_VobaMember |
VOBA [Member] | Periodic amortization [Member] |  |  |  |
Less: Components of amortization: |  |  |  |
Amortization of intangibles |  |  | (20.2)us-gaap_AmortizationOfIntangibleAssets / hrg_ComponentsofamortizationexpenseAxis = hrg_PeriodicAmortizationMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hrg_VobaMember |
DAC [Member] |  |  |  |
Intangible Assets, Including Goodwill [Roll Forward] |  |  |  |
Beginning Balance, Finite Lived Intangible Assets |  |  | 463.8 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hrg_DacMember |
Deferrals |  |  | 176.5 hrg_Deferrals / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hrg_DacMember |
Less: Components of amortization: |  |  |  |
Amortization of intangibles | 13.0 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hrg_DacMember | (6.0)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hrg_DacMember | 5.7 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hrg_DacMember | (16.0)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hrg_DacMember
Adjustment for unrealized investment (gains), net, Goodwill |  |  | (52.2)hrg_AdjustmentForChangeInUnrealizedInvestmentLossesGainsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hrg_DacMember |
Ending Balance, Finite Lived Intangible Assets | 593.8 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hrg_DacMember |  | 593.8 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hrg_DacMember |
DAC [Member] | Unlocking [Member] |  |  |  |
Less: Components of amortization: |  |  |  |
Amortization of intangibles |  |  | (8.1)us-gaap_AmortizationOfIntangibleAssets / hrg_ComponentsofamortizationexpenseAxis = hrg_UnlockingMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hrg_DacMember |
DAC [Member] | Interest [Member] |  |  |  |
Less: Components of amortization: |  |  |  |
Amortization of intangibles |  |  | 10.7 us-gaap_AmortizationOfIntangibleAssets / hrg_ComponentsofamortizationexpenseAxis = hrg_InterestMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hrg_DacMember |
DAC [Member] | Periodic amortization [Member] |  |  |  |
Less: Components of amortization: |  |  |  |
Amortization of intangibles |  |  | 3.1 us-gaap_AmortizationOfIntangibleAssets / hrg_ComponentsofamortizationexpenseAxis = hrg_PeriodicAmortizationMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hrg_DacMember |
Goodwill [Member] |  |  |  |
Less: Components of amortization: |  |  |  |
Effect of translation, Finite Lived intangible assets |  |  | (31.1)us-gaap_FiniteLivedIntangibleAssetsTranslationAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_GoodwillMember |
Indefinite Lived Intangible Assets [Member] |  |  |  |
Less: Components of amortization: |  |  |  |
Effect of translation, Finite Lived intangible assets |  |  | $ (31.1)us-gaap_FiniteLivedIntangibleAssetsTranslationAdjustments / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = hrg_IndefiniteLivedIntangibleAssetsExcludingGoodwillMember |

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