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Significant Accounting Policies and Practices and Recent Accounting Pronouncements - Contractholder Funds and Furutre Policy Benefits (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Schedule of Benefits and Other Changes in Policy Reserves [Line Items]
Available For Sale Securities Carrying Value		$ 52.2
Liability for Future Policy Benefits, Other Increase (Decrease)		1.0	$ 0.8	$ 0.4
Insurance Reserves		1,751.3	$ 1,856.0
Life Contingent Payout Annuity [Member] | Minimum [Member]
Schedule of Benefits and Other Changes in Policy Reserves [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Estimated Average Investment Yield			0.80%
Life Contingent Payout Annuity [Member] | Maximum
Schedule of Benefits and Other Changes in Policy Reserves [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Estimated Average Investment Yield			6.00%
Fixed Maturities Available For Sale [Member]
Schedule of Benefits and Other Changes in Policy Reserves [Line Items]
Available For Sale Securities Carrying Value		1,535.1	$ 1,638.1
Fixed Maturities Available For Sale [Member] | Third party cedants [Member]
Schedule of Benefits and Other Changes in Policy Reserves [Line Items]
Available For Sale Securities Carrying Value		654.3	624.5
Liability for Future Policy Benefits, Other Increase (Decrease)		1.6	12.0
Fixed Maturities Available For Sale [Member] | Other Third Party Cedants [Member]
Schedule of Benefits and Other Changes in Policy Reserves [Line Items]
Available For Sale Securities Carrying Value		250.2	146.3
Insurance Reserves		241.3	135.1
Fixed Maturities Available For Sale [Member] | Ability Re [Member]
Schedule of Benefits and Other Changes in Policy Reserves [Line Items]
Available For Sale Securities Carrying Value		295.6	357.5
Insurance Reserves		271.5	348.4
Fixed Maturities Available For Sale [Member] | Bankers Life Insurance Company [Member]
Schedule of Benefits and Other Changes in Policy Reserves [Line Items]
Available For Sale Securities Carrying Value		125.8	148.3
Insurance Reserves		$ 119.0	$ 145.7
Front Street Future Policyholder Benefits Reserve [Member]
Schedule of Benefits and Other Changes in Policy Reserves [Line Items]
Change In Fair Value Of Derivatives	$ 7.0

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Amount of other increase (decrease) in accrued obligations to policyholders pertaining to insured events for the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
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