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Investments - Net Investment Income (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Schedule of Investments [Line Items] |  |
Document Period End Date | Dec. 31, 2013 |
Gross investment income | $ 204.8 | $ 182.1
External investment expense | (3.6) | (4.1)
Net investment income | 201.2 | 178.0
Fixed maturity available-for-sale securities [Member] |  |
Schedule of Investments [Line Items] |  |
Gross investment income | 191.8 | 167.6
Equity available-for-sale securities [Member] |  |
Schedule of Investments [Line Items] |  |
Gross investment income | 4.5 | 4.7
Policy loans [Member] |  |
Schedule of Investments [Line Items] |  |
Gross investment income | 0.2 | 0.3
Invested cash and short-term investments [Member] |  |
Schedule of Investments [Line Items] |  |
Gross investment income | 0.1 | 0.8
Other investments [Member] |  |
Schedule of Investments [Line Items] |  |
Gross investment income | $ 8.2 | $ 8.7

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + 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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