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Investments (Narratives) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2016
Regulatory Capital Requirements [Abstract] |  |  |
Assets held by insurance regulators | $ 17.0 |  | $ 17.3
Fair value of sold available-for-sale securities | 147.1 |  |
Available-for-sale securities, gross realized gains | 3.4 |  |
Available-for-sale securities, gross realized losses | 1.8 |  |
Other-than-temporary impairments | $ 0.0 | $ 0.0 |

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