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Risks and Uncertainties Risks and Uncertainties - Additional Information (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Sep. 30, 2015
--- | --- | ---
Concentration Risk [Line Items] |  |
Industry Holdings, Number of Top Investments |  | 10
Asset Backed Loans And Other Invested Assets Gross | $ 196.8 | $ 274.6
Equity Securities Holdings Exposure Amount of Single Issuer Greater than Stated Percentage of Total Investments | 10.00% |
Allowance for Doubtful Accounts Receivable, Current | $ 43.6 | $ 44.0
Credit Concentration Risk [Member] |  |
Concentration Risk [Line Items] |  |
Percentage Of Accounts Receivable Major Customers | 9.84456% | 12.67183%
Funds Withheld Receivables [Member] | Fixed Maturities Available For Sale [Member] | Asset-backed Securities [Member] | Financial Services Sector [Member] |  |
Concentration Risk [Line Items] |  |
Funds Withheld Receivable | $ 267.7 | $ 269.7
Funds Withheld Receivables [Member] | Fixed Maturities Available For Sale [Member] | Asset-backed Securities [Member] | Energy, Mining and Metals Sector [Member] |  |
Concentration Risk [Line Items] |  |
Funds Withheld Receivable | $ 210.6 | $ 236.6
Fair Value, Concentration of Risk, All Financial Instruments [Member] |  |
Concentration Risk [Line Items] |  |
Percentage Of Investments Fair Value In Relation To Invested Assets Portfolio | 29.20% | 16.50%
Fair Value, Concentration of Risk, All Financial Instruments [Member] | Financial Services Sector [Member] |  |
Concentration Risk [Line Items] |  |
Number Of Investment Holdings In Industry | 113 | 107
Equity Securities Holdings Exposure Amount of Single Issuer Greater than Stated Percentage of Total Investments | 0.00% | 0.00%
Fair Value, Concentration of Risk, All Financial Instruments [Member] | Energy, Mining and Metals Sector [Member] |  |
Concentration Risk [Line Items] |  |
Number Of Investment Holdings In Industry | 101 | 98
Equity Securities Holdings Exposure Amount of Single Issuer Greater than Stated Percentage of Total Investments | 0.00% | 0.00%
Fair Value, Concentration of Risk, All Financial Instruments [Member] | Funds Withheld Receivables [Member] | Financial Services Sector [Member] |  |
Concentration Risk [Line Items] |  |
Percentage Of Investments Fair Value In Relation To Invested Assets Portfolio | 16.10% | 15.80%
Fair Value, Concentration of Risk, All Financial Instruments [Member] | Funds Withheld Receivables [Member] | Energy, Mining and Metals Sector [Member] |  |
Concentration Risk [Line Items] |  |
Percentage Of Investments Fair Value In Relation To Invested Assets Portfolio | 12.70% | 13.80%

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