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Funds Withheld Receivables Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014 | Jun. 30, 2016
Additional Information [Line Items] |  |  |  |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities | $ 7.4 | $ 2.3 | $ 3.0 |
Equity Securities Holdings Exposure Amount of Single Issuer Greater than Stated Percentage of Total Investments |  |  |  | 10.00%
Insurance Segment [Member] |  |  |  |
Additional Information [Line Items] |  |  |  |
Fair value on securities | $ 39.6 | $ 84.4 |  |
Fair Value, Concentration of Risk, All Financial Instruments [Member] |  |  |  |
Additional Information [Line Items] |  |  |  |
Percentage Of Investments Fair Value In Relation To Invested Assets Portfolio |  | 24.00% |  | 40.90%
Fair Value, Concentration of Risk, All Financial Instruments [Member] | Financial Services Sector [Member] |  |  |  |
Additional Information [Line Items] |  |  |  |
Number Of Investment Holdings In Industry | 81 | 107 |  |
Equity Securities Holdings Exposure Amount of Single Issuer Greater than Stated Percentage of Total Investments | 48.00% | 41.00% |  |
Fair Value, Concentration of Risk, All Financial Instruments [Member] | Energy, Mining and Metals Sector [Member] |  |  |  |
Additional Information [Line Items] |  |  |  |
Number Of Investment Holdings In Industry | 74 | 98 |  |
Equity Securities Holdings Exposure Amount of Single Issuer Greater than Stated Percentage of Total Investments | 43.40% | 39.70% |  |
Fair Value, Concentration of Risk, All Financial Instruments [Member] | Funds Withheld Receivables [Member] | Financial Services Sector [Member] |  |  |  |
Additional Information [Line Items] |  |  |  |
Percentage Of Investments Fair Value In Relation To Invested Assets Portfolio | 14.10% | 15.80% |  |
Fair Value, Concentration of Risk, All Financial Instruments [Member] | Funds Withheld Receivables [Member] | Financial Services Sector [Member] | Asset-backed securities |  |  |  |
Additional Information [Line Items] |  |  |  |
Investment Securities Held by Subsidiaries Subject to Specialized Industry Accounting Principles at Fair Value | $ 232.8 | $ 269.7 |  |
Fair Value, Concentration of Risk, All Financial Instruments [Member] | Funds Withheld Receivables [Member] | Energy, Mining and Metals Sector [Member] |  |  |  |
Additional Information [Line Items] |  |  |  |
Percentage Of Investments Fair Value In Relation To Invested Assets Portfolio | 11.40% | 13.80% |  |
Fair Value, Concentration of Risk, All Financial Instruments [Member] | Funds Withheld Receivables [Member] | Energy, Mining and Metals Sector [Member] | Asset-backed securities |  |  |  |
Additional Information [Line Items] |  |  |  |
Investment Securities Held by Subsidiaries Subject to Specialized Industry Accounting Principles at Fair Value | $ 188.6 | $ 236.6 |  |

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