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Long-Duration Insurance Contracts - Policyholder Account Balances (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Policyholder Account Balance [Roll Forward] |  |  |
Beginning balance | $ 5,187.0 |  |
Interest credited | 52.9 | $ 48.7 |
Ending balance | 5,137.6 |  | $ 5,187.0
Indexed Universal Life Insurance |  |  |
Policyholder Account Balance [Roll Forward] |  |  |
Beginning balance | 57.8 | 47.6 | 47.6
Premiums received | 3.9 | 3.6 |
Surrenders and withdrawals | (0.5) | (0.4) |
Benefit payments | 0.0 | 0.0 |
Net transfers from (to) separate account | (0.1) | 0.0 |
Interest credited | 0.8 | 0.0 |
Other | (0.9) | (0.9) |
Ending balance | $ 61.0 | $ 49.9 | 57.8
Weighted average credit rate | 5.60% | 0.10% |
Net amount at risk | $ 0.0 | $ 0.0 |
Cash surrender value | 43.3 | 32.9 |
Experience Life Insurance |  |  |
Policyholder Account Balance [Roll Forward] |  |  |
Beginning balance | 61.2 | 64.3 | 64.3
Premiums received | (0.1) | (0.2) |
Surrenders and withdrawals | (1.3) | (0.9) |
Benefit payments | (0.5) | (0.5) |
Net transfers from (to) separate account | 0.0 | 0.0 |
Interest credited | 0.7 | 0.8 |
Other | 0.1 | 0.0 |
Ending balance | $ 60.1 | $ 63.5 | 61.2
Weighted average credit rate | 4.90% | 5.00% |
Net amount at risk | $ 0.0 | $ 0.0 |
Cash surrender value | 59.5 | 62.8 |
Fixed Annuity |  |  |
Policyholder Account Balance [Roll Forward] |  |  |
Beginning balance | 4,556.0 | 4,591.1 | 4,591.1
Premiums received | 49.0 | 54.9 |
Surrenders and withdrawals | (112.2) | (98.1) |
Benefit payments | (20.6) | (19.1) |
Net transfers from (to) separate account | 1.9 | 6.6 |
Interest credited | 41.7 | 40.1 |
Other | 4.1 | 1.9 |
Ending balance | $ 4,519.9 | $ 4,577.4 | 4,556.0
Weighted average credit rate | 3.70% | 3.60% |
Net amount at risk | $ 32.0 | $ 39.5 |
Cash surrender value | 4,468.2 | 4,540.9 |
Indexed Annuity |  |  |
Policyholder Account Balance [Roll Forward] |  |  |
Beginning balance | 449.0 | 510.3 | 510.3
Premiums received | 3.6 | 5.1 |
Surrenders and withdrawals | (13.3) | (13.9) |
Benefit payments | (0.8) | (0.6) |
Net transfers from (to) separate account | (0.8) | (0.9) |
Interest credited | 2.7 | 0.0 |
Other | (3.0) | (1.6) |
Ending balance | $ 437.4 | $ 498.4 | 449.0
Weighted average credit rate | 2.50% | 0.00% |
Net amount at risk | $ 0.0 | $ 0.0 |
Cash surrender value | 428.4 | 486.7 |
Non-Life Contingent Single-Premium Immediate Annuity Insurance |  |  |
Policyholder Account Balance [Roll Forward] |  |  |
Beginning balance | 32.6 | 34.4 | 34.4
Premiums received | 0.8 | 1.1 |
Surrenders and withdrawals | (0.6) | (0.1) |
Benefit payments | (1.4) | (1.7) |
Net transfers from (to) separate account | 0.0 | 0.0 |
Interest credited | 0.2 | 0.3 |
Other | 0.0 | (0.2) |
Ending balance | $ 31.6 | $ 33.8 | $ 32.6
Weighted average credit rate | 3.10% | 3.00% |
Net amount at risk | $ 0.0 | $ 0.0 |
Cash surrender value | $ 31.4 | $ 33.7 |

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