Schedule IV - Reinsurance Schedule IV - Reinsurance (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross Amount, life insurance in force	$ 0.0	$ 0.0	$ 0.0
Ceded to other companies, life insurance in force	0.0	0.0	0.0
Assumed from other companies, life insurance in force	244.5	255.5	0.0
Net Amount, life insurance in force	$ 244.5	$ 255.5	$ 0.0
Percentage of amount assumed to net, life insurance in force	100.00%	100.00%	0.00%
Gross Amount, premiums and other considerations	$ 0.0	$ 0.0	$ 0.0
Ceded to other companies, premiums and other considerations	0.0	0.0	0.0
Assumed from other companies, premiums and other considerations	102.0	98.1	6.2
Total Premiums and Other Considerations, net	$ 102.0	$ 98.1	$ 6.2
Percentage of amount assumed to net, premiums and other considerations	100.00%	100.00%	100.00%
Life Insurance Product Line [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross Amount, premiums and other considerations	$ 0.0	$ 0.0	$ 0.0
Ceded to other companies, premiums and other considerations	0.0	0.0	0.0
Assumed from other companies, premiums and other considerations	5.7	3.9	0.9
Net Amount, premiums and other considerations	$ 5.7	$ 3.9	$ 0.9
Percentage of amount assumed to net, premiums and other considerations	100.00%	100.00%	100.00%
Annuity product line
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross Amount, premiums and other considerations	$ 0.0	$ 0.0	$ 0.0
Ceded to other companies, premiums and other considerations	0.0	0.0	0.0
Assumed from other companies, premiums and other considerations	96.3	94.2	5.3
Net Amount, premiums and other considerations	$ 96.3	$ 94.2	$ 5.3
Percentage of amount assumed to net, premiums and other considerations	100.00%	100.00%	100.00%

Total Premiums and Other Considerations, net

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Amount of earned premiums assumed from other entities.

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-Publisher FASB
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-SubTopic 235
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Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums earned.

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Amount of life insurance issued and outstanding assumed from other entities. Includes, but not limited to, dividends and adjustments to face value.

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Amount of life insurance issued and outstanding ceded to other entities. Includes, but not limited to, dividends and adjustments to face value.

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Amount before contracts ceded to other entities and contracts assumed by the entity of life insurance issued and outstanding. Includes, but not limited to, dividends and adjustments to face value.

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Amount after contracts ceded to other entities and contracts assumed by the entity of life insurance issued and outstanding. Includes, but not limited to, dividends and adjustments to face value.

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Percentage of assumed life insurance issued and outstanding contracts to life insurance issued and outstanding after contracts ceded to other entities and contracts assumed by the entity. Includes, but not limited to, dividends and adjustments to face value.

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Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.

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