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%

Asset Backed Loans And Other Invested Assets Gross

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Equity Securities Holdings Exposure Amount of Single Issuer Greater than Stated Percentage of Total Investments

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Industry Holdings, Number of Top Investments

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Number of Investment Holdings in Industry

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Percentage Of Accounts Receivable Major Customers

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Percentage of investments fair value in relation to invested assets portfolio.

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Publisher FASB
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