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Funds Withheld Receivables Additional information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Sep. 30, 2016
Document Period End Date |  |  | Mar. 31, 2017 |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | 135 |  | 135 |  | 146
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities | $ 0.0 | $ 4.5 | $ 1.0 | $ 5.9 |
Insurance Segment [Member] |  |  |  |  |
Available For Sale Depressed Securities Fair Value Disclosure | 21.7 |  | 21.7 |  | $ 39.6
Asset Backed Securities and Corporate Securities [Member] |  |  |  |  |
Available-for-sale Securities, Amortized Cost Basis | 12.5 | 8.7 | 12.5 | 8.7 |
Available-for-sale Securities | $ 11.5 | $ 2.8 | $ 11.5 | $ 2.8 |
Fair Value, Concentration of Risk, All Financial Instruments [Member] | Energy, Mining and Metals Sector [Member] |  |  |  |  |
Equity Securities Holdings Exposure Amount of Single Issuer Greater than Stated Percentage of Total Investments | 42.00% |  | 42.00% |  | 43.40%
Fair Value, Concentration of Risk, All Financial Instruments [Member] | Financial Services Sector [Member] |  |  |  |  |
Equity Securities Holdings Exposure Amount of Single Issuer Greater than Stated Percentage of Total Investments | 47.70% |  | 47.70% |  | 48.00%
Funds Withheld Receivables [Member] | Fair Value, Concentration of Risk, All Financial Instruments [Member] | Energy, Mining and Metals Sector [Member] |  |  |  |  |
Percentage Of Investments Fair Value In Relation To Invested Assets Portfolio | 10.30% |  | 10.30% |  | 11.40%
Funds Withheld Receivables [Member] | Fair Value, Concentration of Risk, All Financial Instruments [Member] | Financial Services Sector [Member] |  |  |  |  |
Percentage Of Investments Fair Value In Relation To Invested Assets Portfolio | 14.90% |  | 14.90% |  | 14.10%

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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