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Investments (Narratives) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Mar. 31, 2024
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments [Abstract] |  |  |
Assets Held by Insurance Regulators | $ 20.1 |  | $ 23.1
Provision for Loan, Lease, and Other Losses [Abstract] |  |  |
Financing Receivable, Credit Loss, Expense (Reversal) | 1.9 | $ 0.5 |
Matured or Redeemed Securities |  |  |
Available-for-sale Securities [Abstract] |  |  |
Available for sale securities, realized gains | 95.5 | 338.0 |
Moving and Storage Treasuries |  |  |
Available-for-sale Securities [Abstract] |  |  |
Available for sale securities, realized gains | 73.0 | 225.0 |
Corporate securities [Member] |  |  |
Available-for-sale Securities [Abstract] |  |  |
Available for sale securities, realized gains | 3.6 | 0.9 |
Available for sale securities, gross realized losses | $ 1.8 | $ 0.5 |

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