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Long-Duration Insurance Contracts - Reconciliation of Policyholder Account Balances to the Balance Sheet (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | $ 5,092.0 |  | $ 5,100.3 |  |  |
Indexed Universal Life |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | 87.2 | $ 82.3 | 72.9 | $ 67.4 | $ 65.2 | $ 57.8
Experience life |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | 55.7 | 56.5 | 58.0 | 58.8 | 59.4 | 61.2
Fixed Account Annuities |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | 4,514.6 | 4,495.1 | 4,508.4 | 4,525.6 | 4,509.5 | 4,556.0
Fixed Indexed Account Annuities |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | 382.3 | 388.6 | 409.5 | 413.6 | 426.6 | 449.0
SPIA (non-life contingent) |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | 27.4 | $ 27.9 | 28.6 | $ 30.1 | $ 30.4 | $ 32.6
Reconciling items |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | $ 24.8 |  | $ 22.9 |  |  |

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