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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 |  | $ 250.2 us-gaap_AssetImpairmentCharges |
Document Period End Date | Dec. 31, 2014 |  |
Unamortized costs exceed ceiling limitations | 190.0 us-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 | 245.0 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / dei_LegalEntityAxis = hrg_RavenReMember |  | 270.0 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / dei_LegalEntityAxis = hrg_RavenReMember
Statutory Accounting Practices, Permitted Practice, Change in Statutory Capital and Surplus | 17.3 hrg_StatutoryAccountingPracticesPermittedPracticeChangeinStatutoryCapitalandSurplus / dei_LegalEntityAxis = hrg_RavenReMember |  | 20.5 hrg_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 |  | $ 190.0 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = hrg_EnergySegmentMember |

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + 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=31042434&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=8077374&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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- Definition The excess of unamortized costs capitalized within a cost center, less related deferred income taxes, over the cost center ceiling limitation, which is charged to expense for oil and gas producing companies that use full cost method of accounting for investments in oil and gas producing properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27015634&loc=d3e516453-122869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph c -Subparagraph 4(ii) -Article 4 + Details
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