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Investments (Narratives) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Debt Securities, Available-for-Sale [Line Items] |  |  |
Available for sale securities, realized gain | $ 1.9 | $ 0.9 | $ 9.5
Fair value of sold available-for-sale securities | 667.0 | 196.2 | 352.3
Gross realized gains on sales of Treasuries | 1.0 | 2.0 |
Available for sale securities, gross realized losses | 3.1 | 0.3 | $ 1.4
Available for sale investments, fair value, recovery amount | 0.5 | 0.5 |
Assets held by insurance regulators | $ 23.1 | $ 23.4 |
Mortgages [Member] | Minimum [Member] |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Mortgage loan interest rate | 3.50% |  |
Mortgages [Member] | Maximum [Member] |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Mortgage loan interest rate |  | 7.70% |

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