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Organization (Details) (USD $) In Millions, except Share data, unless otherwise specified |  |  |  | 0 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Jun. 15, 2012 | Jun. 15, 2012 Hiscox Catastrophe Fund Manager | Aug. 20, 2013 IPO
Organization [Line Items] |  |  |  |  |
Ownership percentage |  |  | 85.00% | 15.00% |
Issuance of common shares (in shares) |  |  |  |  | 24,832,484
Sale of stock, price per share (in dollars per share) | $ 15.05 | $ 10.89 |  |  | $ 12.50
Sale of stock, net proceeds |  |  |  |  | $ 286.0

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