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v3.19.1

Investments (Narratives) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Assets held by insurance regulators |  |  |  | $ 30.8 | $ 32.4
Fair value of sold available-for-sale securities | $ 114.8 | $ 163.7 | $ 190.2 |  |
Available-for-sale securities, gross realized gains | 2.0 | 5.4 | 5.1 |  |
Available-for-sale securities, gross realized losses | 0.2 | 0.3 | 2.2 |  |
Other-than-temporary impairments | 0.0 | 0.0 | $ 0.0 |  |
Mortgages [Member] |  |  |  |  |
Real Estate [Abstract] |  |  |  |  |
Allowance for probable losses and any unamortized premiums or discounts | $ 0.5 | $ 0.5 |  |  |
Mortgages [Member] | Minimum [Member] |  |  |  |  |
Real Estate [Abstract] |  |  |  |  |
Mortgage loan interest rate | 4.10% |  |  |  |
Mortgage loan maturity date | Jan. 01, 2019 |  |  |  |
Mortgages [Member] | Maximum [Member] |  |  |  |  |
Real Estate [Abstract] |  |  |  |  |
Mortgage loan interest rate | 8.20% |  |  |  |
Mortgage loan maturity date | Dec. 31, 2036 |  |  |  |

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