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Reinsurance - Effect of Reinsurance on Premiums Earned, Benefits Incurred and Reserve Changes (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Insurance Premiums:
Direct	$ 419.8	$ 409.3	$ 414.7
Assumed	(0.5)	35.9	32.8
Ceded	(267.9)	(317.5)	(328.2)
Net		56.6	58.8
Benefits and Other Changes in Insurance Policy Reserves:
Net	625.5	852.7	531.8
Life Insurance Product Line [Member]
Insurance Premiums:
Direct	260.1	266.8	279.2
Assumed	(0.5)	35.9	32.8
Ceded	(199.8)	(246.1)	(253.2)
Benefits and Other Changes in Insurance Policy Reserves:
Direct	871.4	1,103.3	776.5
Assumed	5.3	33.0	23.3
Ceded	$ (251.2)	$ (283.6)	$ (268.0)

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Amount of earned premiums assumed from other entities.

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