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Investments - Net Investment Income (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
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | $ 229.6 hrg_GrossInvestmentIncome | $ 210.3 hrg_GrossInvestmentIncome | $ 464.9 hrg_GrossInvestmentIncome | $ 415.1 hrg_GrossInvestmentIncome
External investment expense | (4.6)hrg_ExternalInvestmentExpense | (3.9)hrg_ExternalInvestmentExpense | (9.1)hrg_ExternalInvestmentExpense | (7.5)hrg_ExternalInvestmentExpense
Net investment income | 225.0 us-gaap_InvestmentIncomeInterestAndDividend | 206.4 us-gaap_InvestmentIncomeInterestAndDividend | 455.8 us-gaap_InvestmentIncomeInterestAndDividend | 407.6 us-gaap_InvestmentIncomeInterestAndDividend
Fixed maturity available-for-sale securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | 207.7 hrg_GrossInvestmentIncome / us-gaap_InvestmentTypeAxis = hrg_FixedMaturityAvailableForSaleSecuritiesMember | 188.7 hrg_GrossInvestmentIncome / us-gaap_InvestmentTypeAxis = hrg_FixedMaturityAvailableForSaleSecuritiesMember | 414.2 hrg_GrossInvestmentIncome / us-gaap_InvestmentTypeAxis = hrg_FixedMaturityAvailableForSaleSecuritiesMember | 376.0 hrg_GrossInvestmentIncome / us-gaap_InvestmentTypeAxis = hrg_FixedMaturityAvailableForSaleSecuritiesMember
Equity available-for-sale securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | 7.8 hrg_GrossInvestmentIncome / us-gaap_InvestmentTypeAxis = hrg_EquityAvailableForSaleSecuritiesMember | 5.1 hrg_GrossInvestmentIncome / us-gaap_InvestmentTypeAxis = hrg_EquityAvailableForSaleSecuritiesMember | 17.7 hrg_GrossInvestmentIncome / us-gaap_InvestmentTypeAxis = hrg_EquityAvailableForSaleSecuritiesMember | 9.6 hrg_GrossInvestmentIncome / us-gaap_InvestmentTypeAxis = hrg_EquityAvailableForSaleSecuritiesMember
Asset based loan receivables [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | 10.9 hrg_GrossInvestmentIncome / us-gaap_InvestmentTypeAxis = hrg_AssetbasedloanreceivablesMember | 15.9 hrg_GrossInvestmentIncome / us-gaap_InvestmentTypeAxis = hrg_AssetbasedloanreceivablesMember | 26.5 hrg_GrossInvestmentIncome / us-gaap_InvestmentTypeAxis = hrg_AssetbasedloanreceivablesMember | 27.8 hrg_GrossInvestmentIncome / us-gaap_InvestmentTypeAxis = hrg_AssetbasedloanreceivablesMember
Other investments [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | $ 3.2 hrg_GrossInvestmentIncome / us-gaap_InvestmentTypeAxis = us-gaap_OtherInvestmentsMember | $ 0.6 hrg_GrossInvestmentIncome / us-gaap_InvestmentTypeAxis = us-gaap_OtherInvestmentsMember | $ 6.5 hrg_GrossInvestmentIncome / us-gaap_InvestmentTypeAxis = us-gaap_OtherInvestmentsMember | $ 1.7 hrg_GrossInvestmentIncome / us-gaap_InvestmentTypeAxis = us-gaap_OtherInvestmentsMember

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- Definition Gross investment income. + References No definition available. + Details
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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(a),(b)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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