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Investments - Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities (Detail) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2017	Sep. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Document Period End Date	Mar. 31, 2017
Fixed Maturities Available For Sale [Member]
Schedule of Available-for-sale Securities [Line Items]
Total fixed maturity available-for-sale securities, Amortized Cost	$ 1,566.8	$ 1,531.8
Total investments, Carrying Value	1,543.4	1,535.1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	20.3	46.2
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	43.7	42.9
Available-for-sale Securities, Debt Securities	$ 1,543.4	$ 1,535.1

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The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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