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Investments (Narratives) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Mar. 31, 2016
Regulatory Capital Requirements [Abstract] |  |
Assets held by insurance regulators | $ 17.4 | $ 17.3
Fair value of sold available-for-sale securities | 56.9 |
Available-for-sale securities, gross realized gains | 1.1 |
Available-for-sale securities, gross realized losses | 0.6 |
Other-than-temporary impairments | $ 0.0 |

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