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Reinsurance - Effect of Reinsurance on Premiums Earned, Benefits Incurred and Reserve Changes (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Effects of Reinsurance [Line Items]
Direct Premiums Earned	$ 68.2	$ 65.6	$ 195.5	$ 200.3
Policyholder Benefits and Claims Incurred, Direct	144.1	324.0	698.2	876.8
Assumed Premiums Earned	0.0	8.8	17.4	27.6
Policyholder Benefits and Claims Incurred, Assumed	(43.9)	12.0	(14.8)	27.3
Ceded Premiums Earned	50.4	61.1	168.9	185.9
Policyholder Benefits and Claims Incurred, Ceded	43.9	70.9	190.4	207.8
Premiums Earned, Net, Life	17.8	13.3	44.0	42.0
Benefits and other changes in policy reserves	$ 56.3	$ 265.1	$ 493.0	$ 696.3

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- Definition

Amount of earned premiums assumed from other entities.

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