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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
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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Period Type:	instant

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- References

No definition available.

+ Details

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