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Investments - Schedule of Credit Quality of Asset-Based Loan Portfolio (Detail) - USD ($) $ in Millions | Jun. 30, 2015 | Sep. 30, 2014
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans Receivable, Gross, Commercial, Mortgage |  | $ 403.9 | $ 136.2
Commercial Mortgage Receivable, Percentage of Total |  | 100.00% | 100.00%
Asset-based loans, by credit quality rating |  |  |
Asset Backed Loans And Other Invested Assets Gross |  | $ 534.4 | $ 818.8
Substandard [Member] |  |  |
Asset-based loans, by credit quality rating |  |  |
Asset Backed Loans And Other Invested Assets Gross |  | 271.5 | 250.8
Doubtful [Member] |  |  |
Asset-based loans, by credit quality rating |  |  |
Asset Backed Loans And Other Invested Assets Gross |  | 91.3 |
Special Mention [Member] |  |  |
Asset-based loans, by credit quality rating |  |  |
Asset Backed Loans And Other Invested Assets Gross |  | 44.9 | 372.7
Pass [Member] |  |  |
Asset-based loans, by credit quality rating |  |  |
Asset Backed Loans And Other Invested Assets Gross |  | 126.7 | 195.3
LTV Less Than 50 Percent [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans Receivable, Gross, Commercial, Mortgage |  | $ 93.9 | $ 45.4
Commercial Mortgage Receivable, Percentage of Total |  | 23.30% | 33.30%
LTV 50 to 60 Percent [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans Receivable, Gross, Commercial, Mortgage |  | $ 148.0 | $ 19.9
Commercial Mortgage Receivable, Percentage of Total |  | 36.60% | 14.60%
LTV 60 to 75 Percent [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans Receivable, Gross, Commercial, Mortgage |  | $ 162.0 | $ 70.9
Commercial Mortgage Receivable, Percentage of Total |  | 40.10% | 52.10%
Greater Than One Point Two Five [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans Receivable, Gross, Commercial, Mortgage |  | $ 383.6 | $ 135.4
Greater Than One Point Two Five [Member] | LTV Less Than 50 Percent [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans Receivable, Gross, Commercial, Mortgage |  | 93.2 | 44.6
Greater Than One Point Two Five [Member] | LTV 50 to 60 Percent [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans Receivable, Gross, Commercial, Mortgage |  | 128.4 | 19.9
Greater Than One Point Two Five [Member] | LTV 60 to 75 Percent [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans Receivable, Gross, Commercial, Mortgage |  | 162.0 | 70.9
Greater Than One But Less Than One Point Two Five [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans Receivable, Gross, Commercial, Mortgage |  | 19.6 | 0.0
Greater Than One But Less Than One Point Two Five [Member] | LTV Less Than 50 Percent [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans Receivable, Gross, Commercial, Mortgage |  | 0.0 | 0.0
Greater Than One But Less Than One Point Two Five [Member] | LTV 50 to 60 Percent [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans Receivable, Gross, Commercial, Mortgage |  | 19.6 | 0.0
Greater Than One But Less Than One Point Two Five [Member] | LTV 60 to 75 Percent [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans Receivable, Gross, Commercial, Mortgage |  | 0.0 | 0.0
Ratio Not Available [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans Receivable, Gross, Commercial, Mortgage | [1] | 0.7 | 0.8
Ratio Not Available [Member] | LTV Less Than 50 Percent [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans Receivable, Gross, Commercial, Mortgage | [1] | 0.7 | 0.8
Ratio Not Available [Member] | LTV 50 to 60 Percent [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans Receivable, Gross, Commercial, Mortgage | [1] | 0.0 | 0.0
Ratio Not Available [Member] | LTV 60 to 75 Percent [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans Receivable, Gross, Commercial, Mortgage | [1] | 0.0 | 0.0
Estimate of Fair Value Measurement [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans Receivable, Gross, Commercial, Mortgage |  | $ 403.9 | $ 136.2
Commercial Mortgage Receivable, Percentage of Total |  | 100.00% | 100.00%
Estimate of Fair Value Measurement [Member] | LTV Less Than 50 Percent [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans Receivable, Gross, Commercial, Mortgage |  | $ 93.9 | $ 45.4
Commercial Mortgage Receivable, Percentage of Total |  | 23.30% | 33.30%
Estimate of Fair Value Measurement [Member] | LTV 50 to 60 Percent [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans Receivable, Gross, Commercial, Mortgage |  | $ 148.0 | $ 19.9
Commercial Mortgage Receivable, Percentage of Total |  | 36.60% | 14.60%
Estimate of Fair Value Measurement [Member] | LTV 60 to 75 Percent [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans Receivable, Gross, Commercial, Mortgage |  | $ 162.0 | $ 70.9
Commercial Mortgage Receivable, Percentage of Total |  | 40.10% | 52.10%
[1] | (a) N/A - Current financial information not available.

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