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Risks and Uncertainties Risks and Uncertainties - Additional Information (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Sep. 30, 2015
Concentration Risk [Line Items] |  |
Document Period End Date | Jun. 30, 2016 |
Industry Holdings, Number of Top Investments | 10 |
Asset Backed Loans And Other Invested Assets Gross | $ 82.0 | $ 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 | $ 46.0 | $ 44.0
Credit Concentration Risk [Member] |  |
Concentration Risk [Line Items] |  |
Percentage Of Accounts Receivable Major Customers | 15.00835% | 12.67183%
Fair Value, Concentration of Risk, All Financial Instruments [Member] |  |
Concentration Risk [Line Items] |  |
Percentage Of Investments Fair Value In Relation To Invested Assets Portfolio | 24.30% | 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 | 80 | 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 | 80 | 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 | 13.60% | 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 | 12.10% | 13.80%
Fair Value, Concentration of Risk, All Financial Instruments [Member] | Funds Withheld Receivables [Member] | Asset-backed Securities [Member] | Financial Services Sector [Member] |  |
Concentration Risk [Line Items] |  |
Investment Securities Held by Subsidiaries Subject to Specialized Industry Accounting Principles at Fair Value | $ 225.5 | $ 269.7
Fair Value, Concentration of Risk, All Financial Instruments [Member] | Funds Withheld Receivables [Member] | Asset-backed Securities [Member] | Energy, Mining and Metals Sector [Member] |  |
Concentration Risk [Line Items] |  |
Investment Securities Held by Subsidiaries Subject to Specialized Industry Accounting Principles at Fair Value | 200.4 | $ 236.6
Salus Capital Partners L L C [Member] |  |
Concentration Risk [Line Items] |  |
Asset Backed Loans And Other Invested Assets Gross | $ 12.3 |

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