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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 | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | Sep. 30, 2014
Basis of Presentation [Line Items] |  |  |  |  |
Asset Impairment Charges | $ 249.3 us-gaap_AssetImpairmentCharges | $ 81.0 us-gaap_AssetImpairmentCharges | $ 499.5 us-gaap_AssetImpairmentCharges | $ 82.8 us-gaap_AssetImpairmentCharges |
Impairment of Proved Oil and Gas Properties |  |  | 336.6 hrg_ImpairmentofProvedOilandGasProperties | 81.0 hrg_ImpairmentofProvedOilandGasProperties |
Energy Segment [Member] |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
Asset Impairment Charges | 146.6 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = hrg_EnergySegmentMember |  | 336.6 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = hrg_EnergySegmentMember |  |
Impairment of Proved Oil and Gas Properties |  |  |  | 81.0 hrg_ImpairmentofProvedOilandGasProperties / us-gaap_StatementBusinessSegmentsAxis = hrg_EnergySegmentMember |
FGL [Member] |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 19.30%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / dei_LegalEntityAxis = hrg_FglMember |  | 19.30%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / dei_LegalEntityAxis = hrg_FglMember |  |
Raven Re [Member] |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 238.8 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / dei_LegalEntityAxis = hrg_RavenReMember |  | 238.8 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / dei_LegalEntityAxis = hrg_RavenReMember |  | 251.3 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / dei_LegalEntityAxis = hrg_RavenReMember
Statutory Accounting Practices, Permitted Practice, Change in Statutory Capital and Surplus | 12.4 hrg_StatutoryAccountingPracticesPermittedPracticeChangeinStatutoryCapitalandSurplus / dei_LegalEntityAxis = hrg_RavenReMember |  | 12.4 hrg_StatutoryAccountingPracticesPermittedPracticeChangeinStatutoryCapitalandSurplus / dei_LegalEntityAxis = hrg_RavenReMember |  | 18.8 hrg_StatutoryAccountingPracticesPermittedPracticeChangeinStatutoryCapitalandSurplus / dei_LegalEntityAxis = hrg_RavenReMember
Statutory Accounting Practices, Non-Permitted Practice, Change in Statutory Capital and Surplus | $ (62.8)hrg_StatutoryAccountingPracticesNonPermittedPracticeChangeinStatutoryCapitalandSurplus / dei_LegalEntityAxis = hrg_RavenReMember |  | $ (62.8)hrg_StatutoryAccountingPracticesNonPermittedPracticeChangeinStatutoryCapitalandSurplus / dei_LegalEntityAxis = hrg_RavenReMember |  | $ (81.3)hrg_StatutoryAccountingPracticesNonPermittedPracticeChangeinStatutoryCapitalandSurplus / dei_LegalEntityAxis = hrg_RavenReMember

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- Definition Impairment of Proved Oil and Gas Properties + References No definition available. + Details
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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2420-110228 + Details
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- Definition The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.23(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 24 -Subparagraph c -Article 7 + Details
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