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Funds Withheld Receivables Additional information (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2016
Document Period End Date Dec. 31, 2016    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year 198   146
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities $ 1.0 $ 1.4  
Insurance Segment [Member]      
Available For Sale Depressed Securities Fair Value Disclosure 29.5   $ 39.6
Asset Backed Securities and Corporate Securities [Member]      
Available-for-sale Securities, Amortized Cost Basis 12.0 2.5  
Available-for-sale Securities $ 11.0 $ 1.1  
Fair Value, Concentration of Risk, All Financial Instruments [Member] | Energy, Mining and Metals Sector [Member]      
Equity Securities Holdings Exposure Amount of Single Issuer Greater than Stated Percentage of Total Investments 42.80%   43.40%
Fair Value, Concentration of Risk, All Financial Instruments [Member] | Financial Services Sector [Member]      
Equity Securities Holdings Exposure Amount of Single Issuer Greater than Stated Percentage of Total Investments 46.40%   48.00%
Funds Withheld Receivables [Member] | Fair Value, Concentration of Risk, All Financial Instruments [Member] | Energy, Mining and Metals Sector [Member]      
Percentage Of Investments Fair Value In Relation To Invested Assets Portfolio 11.80%   11.40%
Funds Withheld Receivables [Member] | Fair Value, Concentration of Risk, All Financial Instruments [Member] | Financial Services Sector [Member]      
Percentage Of Investments Fair Value In Relation To Invested Assets Portfolio 15.40%   14.10%