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Investments - Available-for-sale Securities with Cost Basis in Excess of Fair Value - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
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Investments Debt And Equity Securities [Abstract] |  |
Available for sale fixed-maturity and equity securities with cost basis in excess of fair value, cost basis | $ 152.4 | $ 626.0

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- Definition Available for sale fixed maturity and equity securities with cost basis in excess of fair value cost basis. + References No definition available. + Details
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- References No definition available. + Details
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