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Investments - Schedule of Allowance for Credit Losses (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total asset-based loans | $ 818.8 | $ 565.6 | $ 565.6 |
Allowance for Credit Losses on Asset Backed Securities [Roll Forward] |  |  |  |
Balance at beginning of year | 5.2 | 1.4 |  | 5.2
Provision for credit losses | 2.0 | 3.8 | 1.4 |
Balance at end of year | 7.2 | 5.2 | 1.4 | 5.2
Pass [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total asset-based loans | 195.3 | 306.9 |  |
Special Mention [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total asset-based loans | 372.7 | 36.7 |  |
Substandard [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total asset-based loans | 250.8 | 222.0 |  |
Doubtful [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total asset-based loans |  |  |  |

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- Definition Asset Backed Loans And Other Invested Assets Gross + 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=35738203&loc=SL6953423-111524 + Details
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- 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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 3: 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 4: 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=35738203&loc=SL6953423-111524 + Details
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- Details
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