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Other Assets - Schedule of Other Investments (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Sep. 30, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Available For Sale Securities Carrying Value | $ 52.2 |
Unrealized Amortized Cost On Securities | 38.1 |
Investments, Unrealized Gains | 14.1 |
Investments, Unrealized Losses | 0.0 |
Fixed Maturities Available For Sale [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 1,531.8 | $ 1,721.3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 46.2 | 13.2
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 42.9 | 96.4
Available-for-sale Securities, Debt Securities | 1,535.1 | 1,638.1
Available For Sale Securities Carrying Value | 1,535.1 | 1,638.1
Fixed Maturities Available For Sale [Member] | Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 14.1 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.0 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 |
Available For Sale Securities Carrying Value |  | 14.1
Estimate of Fair Value Measurement [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available For Sale Securities Fair Value | 52.2 |
Estimate of Fair Value Measurement [Member] | Fixed Maturities Available For Sale [Member] | Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Securities | 14.1 |
Equity Securities Classified As Held For Trading [Member] | Equity Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available For Sale Securities Carrying Value |  | 32.8
Available-for-sale Equity Securities, Amortized Cost Basis |  | $ 18.7
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 14.1 |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 |
Equity Securities Classified As Held For Trading [Member] | Estimate of Fair Value Measurement [Member] | Equity Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Equity Securities | 32.8 |
Other invested assets | Other Investments Asset [Member] | All Other Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Other invested assets | 5.3 |
Other Investments Gross Unrealized Gain | 0.0 |
Other Short Term Investments Gross Unrealized Losses | 0.0 |
Trading Securities | 5.3 |
Other invested assets | Estimate of Fair Value Measurement [Member] | Other Investments Asset [Member] | All Other Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Trading Securities | $ 5.3 |

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