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- Other-than-Temporary Impairments (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Total other-than-temporary impairments	$ 0.7		$ 22.8
Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Other	0.7	2.9
Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Including Credit Impairments	0.6	0.8	5.7
Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Change Of Intent Operations	0.1	2.2	17.1
Amortized Cost Of Investments With Other Than Temporary Impairments	1.8	9.6		162.3
Fair value on other than temporary impairments	1.1	6.7		138.0
Corporates
Total other-than-temporary impairments	0	1.2	4.1
Municipal Debt Securities [Member]
Total other-than-temporary impairments	0.3
Non-agency residential mortgage-backed securities
Total other-than-temporary impairments	0.1	1.2	7.5
Hybrids
Total other-than-temporary impairments	0	0	9.7
Other invested assets
Total other-than-temporary impairments	$ 0.3	$ 0.5	$ 1.5

X

- Definition

Amortized cost of investments with other than temporary impairments.

+ References

No definition available.

+ Details

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Period Type:	instant

X

- Definition

Fair value of investments with other than temporary impairments.

+ References

No definition available.

+ Details

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X

- Definition

Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Change Of Intent Operations

+ References

No definition available.

+ Details

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Namespace Prefix:	hrg_
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X

- Definition

Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Including Credit Impairments

+ References

No definition available.

+ Details

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Namespace Prefix:	hrg_
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Balance Type:	debit
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X

- Definition

Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Other

+ References

No definition available.

+ Details

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Namespace Prefix:	hrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 8B

-URI http://asc.fasb.org/extlink&oid=27724398&loc=SL6284393-111563

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