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Funds Withheld Receivables Additional information (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2016
Document Period End Date | Dec. 31, 2016 |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | 198 |  | 146
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities | $ 1.0 | $ 1.4 |
Insurance Segment [Member] |  |  |
Available For Sale Depressed Securities Fair Value Disclosure | 29.5 |  | $ 39.6
Asset Backed Securities and Corporate Securities [Member] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 12.0 | 2.5 |
Available-for-sale Securities | $ 11.0 | $ 1.1 |
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 | 42.80% |  | 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 | 46.40% |  | 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 | 11.80% |  | 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 | 15.40% |  | 14.10%

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