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Risks and Uncertainties Risks and Uncertainties - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2016
Concentration Risk [Line Items] |  |  |
Document Period End Date | Dec. 31, 2016 |  |
Industry Holdings, Number of Top Investments | 10 |  |
Allowance for Doubtful Accounts Receivable, Current | $ (48.0) |  | $ (46.8)
Credit Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Percentage Of Net Sales Due To Customers | 11.60% | 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 | 87 |  | 81
Equity Securities Holdings Exposure Amount of Single Issuer Greater than Stated Percentage of Total Investments | 46.40% |  | 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 | 73 |  | 74
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] | Funds Withheld Receivables [Member] | Financial Services Sector [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Percentage Of Investments Fair Value In Relation To Invested Assets Portfolio | 15.40% |  | 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 | 11.80% |  | 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 | $ 247.0 |  | $ 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 | $ 189.7 |  | $ 188.6

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