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Long-Duration Insurance Contracts - Policyholder Account Balances (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Policyholder Account Balance [Roll Forward] |  |  |  |  |
Beginning balance |  |  | $ 5,187.0 |  |
Interest credited | $ 53.8 | $ 50.7 | 106.7 | $ 99.4 |
Ending balance | 5,119.0 |  | 5,119.0 |  | $ 5,187.0
Indexed Universal Life Insurance |  |  |  |  |
Policyholder Account Balance [Roll Forward] |  |  |  |  |
Beginning balance | 61.0 | 49.9 | 57.8 | 47.6 | 47.6
Premiums received | 4.9 | 3.1 | 8.8 | 6.7 |
Surrenders and withdrawals | (0.3) | (0.3) | (0.8) | (0.7) |
Benefit payments | 0.0 | 0.0 | 0.0 | 0.0 |
Net transfers from (to) separate account | 0.0 | (0.2) | (0.1) | (0.2) |
Interest credited | 0.8 | 0.2 | 1.6 | 0.2 |
Other | (1.2) | (0.7) | (2.1) | (1.6) |
Ending balance | $ 65.2 | $ 52.0 | $ 65.2 | $ 52.0 | 57.8
Weighted average credit rate | 5.20% | 1.60% | 5.40% | 0.80% |
Net amount at risk | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 |
Cash surrender value | 47.1 | 32.9 | 47.1 | 32.9 |
Experience Life Insurance |  |  |  |  |
Policyholder Account Balance [Roll Forward] |  |  |  |  |
Beginning balance | 60.1 | 63.5 | 61.2 | 64.3 | 64.3
Premiums received | (0.2) | (0.2) | (0.3) | (0.4) |
Surrenders and withdrawals | (0.8) | (0.6) | (2.1) | (1.5) |
Benefit payments | (0.4) | (0.4) | (0.9) | (0.9) |
Net transfers from (to) separate account | 0.0 | 0.0 | 0.0 | 0.0 |
Interest credited | 0.8 | 0.7 | 1.5 | 1.5 |
Other | (0.1) | 0.0 | 0.0 | 0.0 |
Ending balance | $ 59.4 | $ 63.0 | $ 59.4 | $ 63.0 | 61.2
Weighted average credit rate | 5.50% | 4.50% | 5.00% | 4.80% |
Net amount at risk | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 |
Cash surrender value | 58.8 | 62.8 | 58.8 | 62.8 |
Fixed Annuity |  |  |  |  |
Policyholder Account Balance [Roll Forward] |  |  |  |  |
Beginning balance | 4,519.9 | 4,577.4 | 4,556.0 | 4,591.1 | 4,591.1
Premiums received | 42.8 | 59.0 | 91.8 | 113.9 |
Surrenders and withdrawals | (86.4) | (103.9) | (198.6) | (202.0) |
Benefit payments | (16.3) | (17.8) | (36.9) | (36.9) |
Net transfers from (to) separate account | 6.3 | 7.9 | 8.2 | 14.5 |
Interest credited | 41.3 | 39.8 | 83.0 | 79.9 |
Other | 1.9 | 1.1 | 6.0 | 3.0 |
Ending balance | $ 4,509.5 | $ 4,563.5 | $ 4,509.5 | $ 4,563.5 | 4,556.0
Weighted average credit rate | 3.70% | 3.50% | 3.70% | 3.60% |
Net amount at risk | $ 30.9 | $ 16.2 | $ 30.9 | $ 16.2 |
Cash surrender value | 4,466.3 | 4,650.8 | 4,466.3 | 4,650.8 |
Indexed Annuity |  |  |  |  |
Policyholder Account Balance [Roll Forward] |  |  |  |  |
Beginning balance | 437.4 | 498.4 | 449.0 | 510.3 | 510.3
Premiums received | 4.1 | 5.4 | 7.7 | 10.5 |
Surrenders and withdrawals | (13.5) | (18.6) | (26.8) | (32.5) |
Benefit payments | (0.8) | (0.9) | (1.6) | (1.5) |
Net transfers from (to) separate account | (0.6) | (2.4) | (1.4) | (3.3) |
Interest credited | 3.2 | 0.9 | 5.9 | 0.9 |
Other | (3.2) | (1.6) | (6.2) | (3.2) |
Ending balance | $ 426.6 | $ 481.2 | $ 426.6 | $ 481.2 | 449.0
Weighted average credit rate | 3.00% | 0.70% | 2.70% | 0.40% |
Net amount at risk | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 |
Cash surrender value | 428.4 | 486.7 | 428.4 | 486.7 |
Non-Life Contingent Single-Premium Immediate Annuity Insurance |  |  |  |  |
Policyholder Account Balance [Roll Forward] |  |  |  |  |
Beginning balance | 31.6 | 33.8 | 32.6 | 34.4 | 34.4
Premiums received | 0.1 | 1.0 | 0.9 | 2.1 |
Surrenders and withdrawals | (0.3) | (0.1) | (0.9) | (0.2) |
Benefit payments | (1.3) | (1.4) | (2.7) | (3.1) |
Net transfers from (to) separate account | 0.0 | 0.0 | 0.0 | 0.0 |
Interest credited | 0.3 | 0.2 | 0.5 | 0.5 |
Other | 0.0 | 0.0 | 0.0 | (0.2) |
Ending balance | $ 30.4 | $ 33.5 | $ 30.4 | $ 33.5 | $ 32.6
Weighted average credit rate | 3.90% | 2.40% | 3.10% | 3.00% |
Net amount at risk | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 |
Cash surrender value | $ 31.4 | $ 33.7 | $ 31.4 | $ 33.7 |

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