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Investments (Narratives) (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Mar. 31, 2017
Regulatory Capital Requirements [Abstract] |  |
Assets held by insurance regulators | $ 28.2 | $ 16.8
Fair value of sold available-for-sale securities | 68.5 |
Available-for-sale securities, gross realized gains | 2.6 |
Available-for-sale securities, gross realized losses | 0.1 |
Other-than-temporary impairments | $ 0.0 |

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