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Investments - Other-than-Temporary Impairments (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended | 15 Months Ended
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2013 | Jul. 01, 2012 | Jul. 01, 2013
Document Period End Date |  | Jun. 30, 2013 |  |
Credit losses in operations, including credit impairments | $ 0.5 | $ 0.8 |  |
Change-of-intent, and non-credit losses in other comprehensive income |  | 0 | 2.6 | 0.7
Other-than-temporary impairments recognized in net income: |  |  |  |
Total other-than-temporary impairments | 0.7 | 1.6 | 19.8 | 2.5
Credit losses in operations, change of intent operations | 0.2 | 0.9 | 15.0 | 1.8
Corporates [Member] |  |  |  |
Other-than-temporary impairments recognized in net income: |  |  |  |
Total other-than-temporary impairments | 0 | 0 | 2.2 | 1.5
Non-agency residential mortgage-backed securities [Member] |  |  |  |
Other-than-temporary impairments recognized in net income: |  |  |  |
Total other-than-temporary impairments | 0.2 | 1.1 | 6.9 | 0.8
Hybrids [Member] |  |  |  |
Other-than-temporary impairments recognized in net income: |  |  |  |
Total other-than-temporary impairments | 0 | 0 | 9.7 | 0
Other Invested Assets [Member] |  |  |  |
Other-than-temporary impairments recognized in net income: |  |  |  |
Total other-than-temporary impairments | $ 0.5 | $ 0.5 | $ 1.0 | $ 0.2

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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 Non Credit Related Losses Recognized In Other Comprehensive Income + References No definition available. + Details
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- Definition Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Change Of Intent Operations + References No definition available. + Details
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- Definition Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Including Credit Impairments + References No definition available. + Details
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- 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 + Details
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