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Investments (Narratives) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Assets held by insurance regulators |  |  |  | $ 27.7 | $ 30.8
Fair value of sold available-for-sale securities | $ 523.9 | $ 264.5 | $ 114.8 |  |
Available-for-sale securities, gross realized gains | 9.6 | 6.4 | 2.0 |  |
Available-for-sale securities, gross realized losses | $ 2.1 | $ 0.2 | 0.2 |  |
Mortgages [Member] | Minimum [Member] |  |  |  |  |
Real Estate [Abstract] |  |  |  |  |
Mortgage loan interest rate | 3.80% |  |  |  |
Debt instrument, maturity year | 2021 |  |  |  |
Available for sale investments, unrealized loss position |  |  |  |  |
Available for sale investments, unrealized loss position | $ 0.4 |  |  |  |
Mortgages [Member] | Maximum [Member] |  |  |  |  |
Real Estate [Abstract] |  |  |  |  |
Mortgage loan interest rate | 8.20% |  |  |  |
Debt instrument, maturity year | 2036 |  |  |  |
Available for sale investments, unrealized loss position |  |  |  |  |
Available for sale investments, unrealized loss position |  |  | $ 0.5 |  |

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