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Investments - Net Investment Income (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Schedule of Investments [Line Items]
Gross investment income	$ 236.8	$ 217.7	$ 701.7	$ 632.8
External investment expense	(5.2)	(6.8)	(14.3)	(14.3)
Net investment income	231.6	210.9	687.4	618.5
Fixed maturity available-for-sale securities [Member]
Schedule of Investments [Line Items]
Gross investment income	209.6	192.1	623.8	568.1
Equity available-for-sale securities [Member]
Schedule of Investments [Line Items]
Gross investment income	10.2	7.1	27.9	16.7
Asset based loan receivables [Member]
Schedule of Investments [Line Items]
Gross investment income	9.7	16.7	36.2	44.5
Other investments [Member]
Schedule of Investments [Line Items]
Gross investment income	$ 7.3	$ 1.8	$ 13.8	$ 3.5

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+ References

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- Definition

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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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