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Investments - Schedule of Credit Quality of Asset-Based Loan Portfolio (Detail) - USD ($) $ in Millions | Jun. 30, 2016 | Sep. 30, 2015
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Asset-based loans, by credit quality rating |  |
Asset Backed Loans And Other Invested Assets Gross | $ 82.0 | $ 274.6
Substandard [Member] |  |
Asset-based loans, by credit quality rating |  |
Asset Backed Loans And Other Invested Assets Gross | 11.2 | 74.0
Doubtful [Member] |  |
Asset-based loans, by credit quality rating |  |
Asset Backed Loans And Other Invested Assets Gross | 69.5 | 99.2
Special Mention [Member] |  |
Asset-based loans, by credit quality rating |  |
Asset Backed Loans And Other Invested Assets Gross | $ 1.3 | 32.4
Pass [Member] |  |
Asset-based loans, by credit quality rating |  |
Asset Backed Loans And Other Invested Assets Gross |  | $ 69.0

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