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Risks and Uncertainties Risks and Uncertainties - Additional Information (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Sep. 30, 2016
Concentration Risk [Line Items] |  |
Document Period End Date | Mar. 31, 2017 |
Industry Holdings, Number of Top Investments | 10 |
Allowance for Doubtful Accounts Receivable, Current | $ (45.3) | $ (46.8)
Credit Concentration Risk [Member] |  |
Concentration Risk [Line Items] |  |
Percentage Of Net Sales Due To Customers | 15.10% | 13.10%
Fair Value, Concentration of Risk, All Financial Instruments [Member] | Financial Services Sector [Member] |  |
Concentration Risk [Line Items] |  |
Number Of Investment Holdings In Industry | 92 | 81
Equity Securities Holdings Exposure Amount of Single Issuer Greater than Stated Percentage of Total Investments | 47.70% | 48.00%
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 | 66 | 74
Equity Securities Holdings Exposure Amount of Single Issuer Greater than Stated Percentage of Total Investments | 42.00% | 43.40%
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 | 14.90% | 14.10%
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 | 10.30% | 11.40%
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 | $ 243.2 | $ 232.8
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 | $ 168.5 | $ 188.6

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