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

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- Definition

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+ References

No definition available.

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- Definition

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+ 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

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