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Long-Duration Insurance Contracts - Policyholder Account Balances (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Policyholder Account Balance [Roll Forward] |  |  |  |  |
Beginning balance |  |  | $ 5,187.0 |  |
Interest credited | $ 54.8 | $ 52.7 | 161.5 | $ 152.1 |
Ending balance | 5,128.6 |  | 5,128.6 |  | $ 5,187.0
Indexed Universal Life Insurance |  |  |  |  |
Policyholder Account Balance [Roll Forward] |  |  |  |  |
Beginning balance | 65.2 | 52.0 | 57.8 | 47.6 | 47.6
Premiums received | 3.5 | 3.1 | 12.3 | 9.8 |
Surrenders and withdrawals | (0.9) | (0.2) | (1.7) | (0.9) |
Benefit payments | 0.0 | 0.0 | 0.0 | 0.0 |
Net transfers from (to) separate account | (0.2) | (0.3) | (0.3) | (0.5) |
Interest credited | 0.6 | 0.7 | 2.2 | 0.9 |
Other | (0.8) | (0.6) | (2.9) | (2.2) |
Ending balance | $ 67.4 | $ 54.7 | $ 67.4 | $ 54.7 | 57.8
Weighted average credit rate | 3.70% | 5.40% | 4.80% | 2.30% |
Net amount at risk | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 |
Cash surrender value | 49.1 | 37.7 | 49.1 | 37.7 |
Experience Life Insurance |  |  |  |  |
Policyholder Account Balance [Roll Forward] |  |  |  |  |
Beginning balance | 59.4 | 63.0 | 61.2 | 64.3 | 64.3
Premiums received | (0.2) | (0.1) | (0.5) | (0.5) |
Surrenders and withdrawals | (0.8) | (1.1) | (2.9) | (2.6) |
Benefit payments | (0.3) | (0.4) | (1.2) | (1.3) |
Net transfers from (to) separate account | 0.0 | 0.0 | 0.0 | 0.0 |
Interest credited | 0.7 | 0.8 | 2.2 | 2.3 |
Other | 0.0 | (0.1) | 0.0 | (0.1) |
Ending balance | $ 58.8 | $ 62.1 | $ 58.8 | $ 62.1 | 61.2
Weighted average credit rate | 4.90% | 5.20% | 5.00% | 5.00% |
Net amount at risk | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 |
Cash surrender value | 58.2 | 61.4 | 58.2 | 61.4 |
Fixed Annuity |  |  |  |  |
Policyholder Account Balance [Roll Forward] |  |  |  |  |
Beginning balance | 4,509.5 | 4,563.5 | 4,556.0 | 4,591.1 | 4,591.1
Premiums received | 59.8 | 70.0 | 151.6 | 183.9 |
Surrenders and withdrawals | (85.3) | (87.8) | (283.9) | (289.8) |
Benefit payments | (12.6) | (21.2) | (49.5) | (58.1) |
Net transfers from (to) separate account | 8.8 | 3.0 | 17.0 | 17.5 |
Interest credited | 42.1 | 40.8 | 125.1 | 120.7 |
Other | 3.3 | 0.2 | 9.3 | 3.2 |
Ending balance | $ 4,525.6 | $ 4,568.5 | $ 4,525.6 | $ 4,568.5 | 4,556.0
Weighted average credit rate | 3.80% | 3.60% | 3.70% | 3.60% |
Net amount at risk | $ 29.0 | $ 53.9 | $ 29.0 | $ 53.9 |
Cash surrender value | 4,483.6 | 4,512.3 | 4,483.6 | 4,512.3 |
Indexed Annuity |  |  |  |  |
Policyholder Account Balance [Roll Forward] |  |  |  |  |
Beginning balance | 426.6 | 481.2 | 449.0 | 510.3 | 510.3
Premiums received | 3.7 | 5.3 | 11.4 | 15.8 |
Surrenders and withdrawals | (12.1) | (17.6) | (38.9) | (50.1) |
Benefit payments | (1.7) | (0.6) | (3.3) | (2.1) |
Net transfers from (to) separate account | (0.6) | (3.1) | (2.0) | (6.4) |
Interest credited | 2.9 | 3.0 | 8.8 | 3.9 |
Other | (5.2) | (0.2) | (11.4) | (3.4) |
Ending balance | $ 413.6 | $ 468.0 | $ 413.6 | $ 468.0 | 449.0
Weighted average credit rate | 2.80% | 2.60% | 2.80% | 1.10% |
Net amount at risk | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 |
Cash surrender value | 406.9 | 456.8 | 406.9 | 456.8 |
Non-Life Contingent Single-Premium Immediate Annuity Insurance |  |  |  |  |
Policyholder Account Balance [Roll Forward] |  |  |  |  |
Beginning balance | 30.4 | 33.5 | 32.6 | 34.4 | 34.4
Premiums received | 0.5 | 0.5 | 1.4 | 2.6 |
Surrenders and withdrawals | 0.0 | 0.0 | (0.9) | (0.2) |
Benefit payments | (1.2) | (1.2) | (3.9) | (4.3) |
Net transfers from (to) separate account | 0.0 | 0.0 | 0.0 | 0.0 |
Interest credited | 0.2 | 0.3 | 0.7 | 0.8 |
Other | 0.2 | 0.0 | 0.2 | (0.2) |
Ending balance | $ 30.1 | $ 33.1 | $ 30.1 | $ 33.1 | $ 32.6
Weighted average credit rate | 2.70% | 3.70% | 3.10% | 3.10% |
Net amount at risk | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 |
Cash surrender value | $ 29.6 | $ 32.9 | $ 29.6 | $ 32.9 |

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