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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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