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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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Amount before allowance of mortgage loans on existing land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 310



-SubTopic 10



-Section 50



-Paragraph 3



-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5066-111524



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 942



-SubTopic 210



-Section S99



-Paragraph 1



-Subparagraph (SX 210.9-03.7(a)(3))



-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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