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Long-Duration Insurance Contracts - Policyholder Account Balances (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Policyholder Account Balance [Roll Forward] |  |  |  |
Beginning balance | $ 5,187.0 |  |  |
Interest credited | 215.9 | $ 205.7 | $ 173.4 | [1]
Ending balance | 5,100.3 | 5,187.0 |  |
Indexed Universal Life |  |  |  |
Policyholder Account Balance [Roll Forward] |  |  |  |
Beginning balance | 57.8 | 47.6 |  |
Premiums received | 17.8 | 13.6 |  |
Surrenders and withdrawals | (2.2) | (1.1) |  |
Benefit payments | 0.0 | 0.0 |  |
Net transfers from (to) separate account | (0.2) | (0.6) |  |
Interest credited | 3.9 | 1.5 |  |
Other | (4.2) | (3.2) |  |
Ending balance | $ 72.9 | $ 57.8 | 47.6 |
Weighted-average crediting rate | 6.10% | 2.80% |  |
Net amount at risk | $ 0.0 | $ 0.0 |  |
Cash surrender value | 54.5 | 40.5 |  |
Experience Life |  |  |  |
Policyholder Account Balance [Roll Forward] |  |  |  |
Beginning balance | 61.2 | 64.3 |  |
Premiums received | (0.8) | (0.8) |  |
Surrenders and withdrawals | (3.7) | (3.7) |  |
Benefit payments | (1.6) | (1.7) |  |
Net transfers from (to) separate account | 0.0 | 0.0 |  |
Interest credited | 2.9 | 3.1 |  |
Other | 0.0 | 0.0 |  |
Ending balance | $ 58.0 | $ 61.2 | 64.3 |
Weighted-average crediting rate | 5.00% | 5.00% |  |
Net amount at risk | $ 0.0 | $ 0.0 |  |
Cash surrender value | 57.4 | 60.5 |  |
Fixed Account Annuities |  |  |  |
Policyholder Account Balance [Roll Forward] |  |  |  |
Beginning balance | 4,556.0 | 4,591.1 |  |
Premiums received | 203.5 | 236.3 |  |
Surrenders and withdrawals | (388.6) | (391.8) |  |
Benefit payments | (69.2) | (75.1) |  |
Net transfers from (to) separate account | 23.3 | 23.7 |  |
Interest credited | 167.7 | 162.0 |  |
Other | 15.7 | 9.8 |  |
Ending balance | $ 4,508.4 | $ 4,556.0 | 4,591.1 |
Weighted-average crediting rate | 3.80% | 3.60% |  |
Net amount at risk | $ 29.4 | $ 35.9 |  |
Cash surrender value | 4,452.6 | 4,507.5 |  |
Fixed Indexed Account Annuities |  |  |  |
Policyholder Account Balance [Roll Forward] |  |  |  |
Beginning balance | 449.0 | 510.3 |  |
Premiums received | 15.9 | 20.1 |  |
Surrenders and withdrawals | (51.2) | (67.0) |  |
Benefit payments | (4.2) | (3.1) |  |
Net transfers from (to) separate account | (2.2) | (8.2) |  |
Interest credited | 16.1 | 5.3 |  |
Other | (13.9) | (8.4) |  |
Ending balance | $ 409.5 | $ 449.0 | 510.3 |
Weighted-average crediting rate | 3.80% | 1.10% |  |
Net amount at risk | $ 0.0 | $ 0.0 |  |
Cash surrender value | 402.0 | 439.9 |  |
SPIA (non-life contingent) |  |  |  |
Policyholder Account Balance [Roll Forward] |  |  |  |
Beginning balance | 32.6 | 34.4 |  |
Premiums received | 1.9 | 3.4 |  |
Surrenders and withdrawals | (1.3) | (0.4) |  |
Benefit payments | (5.5) | (5.9) |  |
Net transfers from (to) separate account | 0.0 | 0.0 |  |
Interest credited | 0.9 | 1.0 |  |
Other | 0.0 | 0.1 |  |
Ending balance | $ 28.6 | $ 32.6 | $ 34.4 |
Weighted-average crediting rate | 3.10% | 3.10% |  |
Net amount at risk | $ 0.0 | $ 0.0 |  |
Cash surrender value | $ 28.3 | $ 32.3 |  |
[1] | Recast for the adoption of ASU 2018-12.

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