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Investments - Net Investment Gains (Losses) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014
Gain (Loss) on Investments [Abstract] |  |  |  |
Net realized gains on fixed maturity available-for-sale securities | $ 7.7 hrg_GainLossOnSaleOfAvailableForSaleSecurities | $ 7.9 hrg_GainLossOnSaleOfAvailableForSaleSecurities | $ 5.9 hrg_GainLossOnSaleOfAvailableForSaleSecurities | $ 17.7 hrg_GainLossOnSaleOfAvailableForSaleSecurities
Realized gains on equity securities | (6.4)hrg_GainLossOnSaleOfEquitySecurities | 5.4 hrg_GainLossOnSaleOfEquitySecurities | (3.2)hrg_GainLossOnSaleOfEquitySecurities | 10.8 hrg_GainLossOnSaleOfEquitySecurities
Net realized gains on securities | 1.3 us-gaap_GainLossOnSaleOfSecuritiesNet | 13.3 us-gaap_GainLossOnSaleOfSecuritiesNet | 2.7 us-gaap_GainLossOnSaleOfSecuritiesNet | 28.5 us-gaap_GainLossOnSaleOfSecuritiesNet
Realized gains (losses) on certain derivative instruments | 43.2 us-gaap_GainLossOnSaleOfDerivatives | 50.0 us-gaap_GainLossOnSaleOfDerivatives | 88.2 us-gaap_GainLossOnSaleOfDerivatives | 110.6 us-gaap_GainLossOnSaleOfDerivatives
Unrealized gains on certain derivative instruments | (51.2)us-gaap_UnrealizedGainLossOnDerivatives | (27.5)us-gaap_UnrealizedGainLossOnDerivatives | (50.7)us-gaap_UnrealizedGainLossOnDerivatives | 39.3 us-gaap_UnrealizedGainLossOnDerivatives
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | 0.4 us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet | 0 us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet | 1.0 us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet | 0 us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet
Change in fair value of derivatives | (7.6)hrg_ChangeInFairValueOfDerivatives | 22.5 hrg_ChangeInFairValueOfDerivatives | 38.5 hrg_ChangeInFairValueOfDerivatives | 149.9 hrg_ChangeInFairValueOfDerivatives
Realized gains on other invested assets | 2.4 us-gaap_GainLossOnSaleOfOtherInvestments | 5.1 us-gaap_GainLossOnSaleOfOtherInvestments | 6.9 us-gaap_GainLossOnSaleOfOtherInvestments | 4.4 us-gaap_GainLossOnSaleOfOtherInvestments
Net investment gains (losses) | $ (3.9)us-gaap_GainLossOnInvestments | $ 40.9 us-gaap_GainLossOnInvestments | $ 48.1 us-gaap_GainLossOnInvestments | $ 182.8 us-gaap_GainLossOnInvestments

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- Definition Change in fair value of derivatives. + References No definition available. + Details
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- Definition Gain loss on sale of available for sale securities. + References No definition available. + Details
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- Definition Gain loss on sale of equity securities. + References No definition available. + Details
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- Definition Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -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 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings. + 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 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The difference between the book value and the sale price of other nonspecific investments. This element is used when other, more specific, elements are not appropriate. This element refers to the gain (loss) included in earnings. + 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 + Details
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- Definition The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + 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 + Details
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