Schedule IV - Reinsurance (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross Amount, life insurance in force	$ 2,596.7	$ 2,436.3	$ 2,256.7
Ceded to other companies, life insurance in force	(1,965.4)	(1,929.0)	(1,180.4)
Assumed from other companies, life insurance in force	17.3	22.8	22.6
Net Amount, life insurance in force	648.6	530.1	1,098.9
Percentage of amount assumed to net, life insurance in force	2.67%	4.30%	2.06%
Gross Amount, premiums and other considerations	414.7	415.9	226.3
Ceded to other companies, premiums and other considerations	(328.2)	(369.5)	(160.4)
Assumed from other companies, premiums and other considerations	32.8	47.2	22.8
Total Premiums and Other Considerations, net	119.3	93.6	88.7
Net Amount, premiums and other considerations	58.8	55.3	39.0
Percentage of amount assumed to net, premiums and other considerations	27.49%	50.43%	25.70%
Life Insurance Product Line
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross Amount, premiums and other considerations	279.2	298.0	157.8
Ceded to other companies, premiums and other considerations	(253.2)	(289.9)	(141.6)
Assumed from other companies, premiums and other considerations	32.8	47.2	22.8
Net Amount, premiums and other considerations	58.8	55.3	39.0
Percentage of amount assumed to net, premiums and other considerations	55.78%	85.35%	58.46%
Annuity product line
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross Amount, premiums and other considerations	135.5	117.9	68.5
Ceded to other companies, premiums and other considerations	(75.0)	(79.6)	(18.8)
Assumed from other companies, premiums and other considerations	0	0	0
Net Amount, premiums and other considerations	$ 60.5	$ 38.3	$ 49.7
Percentage of amount assumed to net, premiums and other considerations	0.00%	0.00%	0.00%

Total Premiums and Other Considerations, net

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Amount of earned premiums assumed from other entities.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 17

-Article 12

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-Publisher FASB

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-SubTopic 235

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