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Reinsurance - Effect of Reinsurance on Premiums Earned, Benefits Incurred and Reserve Changes (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Reinsurance Disclosures [Abstract]
Document Period End Date			Mar. 31, 2014
Insurance Premiums:
Direct	$ 67.0	$ 70.0	$ 134.7	$ 142.4
Assumed	9.5	3.3	18.8	15.4
Ceded	(61.7)	(59.2)	(124.8)	(129.9)
Net	14.8	14.1	28.7	27.9
Benefits and Other Changes in Insurance Policy Reserves:
Direct	256.4	289.3	552.8	428.9
Assumed	9.9	1.0	15.3	7.5
Ceded	(69.8)	(49.4)	(136.9)	(111.9)
Net	$ 196.5	$ 240.9	$ 431.2	$ 324.5

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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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