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Funds Withheld Receivables Net Investment Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross Investment Income | $ 67.0 | $ 84.3 | $ 90.1
Fixed Maturity Available For Sale Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross Investment Income | 56.0 | 58.6 | 55.7
Equity Securities Available For Sale [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross Investment Income | 2.1 | 2.6 | 4.1
Asset based loan receivables [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross Investment Income | 3.5 | 16.1 | 28.4
Other Investments [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross Investment Income | $ 5.4 | $ 7.0 | $ 1.9

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