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Investments - Net Investment Income (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Schedule of Investments [Line Items] |  |  |  |
Document Period End Date |  |  | Jun. 30, 2014 |
Gross investment income | $ 217.7 | $ 191.8 | $ 632.8 | $ 548.0
External investment expense | (6.8) | (3.6) | (14.3) | (10.5)
Net investment income | 210.9 | 188.2 | 618.5 | 537.5
Fixed maturity available-for-sale securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | 196.6 | 178.0 | 581.9 | 506.4
Equity available-for-sale securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | 7.1 | 3.9 | 16.7 | 11.5
Policy loans [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | 0.2 | 0.1 | 0.5 | 0.6
Invested cash and short-term investments [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | 0.1 | 0.2 | 0.2 | 1.4
Asset based loan receivables [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | 12.2 | 8.2 | 30.7 | 25.8
Other investments [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | $ 1.5 | $ 1.4 | $ 2.8 | $ 2.3

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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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