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Investments - Portfolio of Asset-Backed Loans and Other Invested Assets (Detail) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Asset-backed loans, by major industry: |  |  |  |
Total asset-backed loans | $ 196.8 |  | $ 274.6 |
Less: Allowance for credit losses | 43.7 |  | 47.9 |
Total asset-backed loans, net | 153.1 |  | 226.7 |
Financing Receivable, Allowance for Credit Losses | 43.7 | $ 5.3 | 47.9 | $ 5.5
Provision for Loan, Lease, and Other Losses | 7.9 | $ (0.2) |  |
Apparel [Member] |  |  |  |
Asset-backed loans, by major industry: |  |  |  |
Total asset-backed loans | 55.5 |  | 66.0 |
Jewelry [Member] |  |  |  |
Asset-backed loans, by major industry: |  |  |  |
Total asset-backed loans | 36.3 |  | 36.9 |
Manufacturing [Member] |  |  |  |
Asset-backed loans, by major industry: |  |  |  |
Total asset-backed loans | 30.4 |  | 32.7 |
Other [Member] |  |  |  |
Asset-backed loans, by major industry: |  |  |  |
Total asset-backed loans | 29.1 |  | 93.1 |
Electronics [Member] |  |  |  |
Asset-backed loans, by major industry: |  |  |  |
Total asset-backed loans | $ 45.5 |  | $ 45.9 |

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- Definition Asset Backed Financing [Abstract] + References No definition available. + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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