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Investments - Net Investment Income (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Schedule of Investments [Line Items] |  |  |
Gross investment income | $ 859.8 | $ 751.5 | $ 734.4
External investment expense | (17.1) | (16.8) | (11.7)
Net investment income | 842.2 | 734.7 | 722.7
Fixed maturity available-for-sale securities |  |  |
Schedule of Investments [Line Items] |  |  |
Gross investment income | 784.8 | 686.2 | 707.1
Equity available-for-sale securities |  |  |
Schedule of Investments [Line Items] |  |  |
Gross investment income | 24.7 | 14.8 | 14.0
Policy loans |  |  |
Schedule of Investments [Line Items] |  |  |
Gross investment income | 0.7 | 0.8 | 0.7
Invested cash and short-term investments |  |  |
Schedule of Investments [Line Items] |  |  |
Gross investment income | 0.3 | 1.4 | 4.9
Asset based loan receivables [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Gross investment income | 41.5 | 35.4 | 8.6
Other investments |  |  |
Schedule of Investments [Line Items] |  |  |
Gross investment income | $ 7.1 | $ 12.9 | $ (0.9)

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a, b -Article 5 + Details
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- Details
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