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Long-Duration Insurance Contracts - Reconciliation of Policyholder Account Balances to the Balance Sheet (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | $ 5,204.0 |  | $ 5,260.6 |  |  |
Indexed Universal Life |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | 54.7 | $ 52.0 | 47.6 | $ 44.8 | $ 42.6 | $ 39.1
Experience Life |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | 62.1 | 63.0 | 64.3 | 64.7 | 65.4 | 66.2
Fixed Account Annuities |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | 4,568.5 | 4,563.5 | 4,591.1 | 4,604.1 | 4,573.7 | 4,532.7
Fixed Indexed Account Annuities |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | 468.0 | 481.2 | 510.3 | 516.9 | 518.2 | 522.6
SPIA (non-life contingent) |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | 33.1 | $ 33.5 | 34.4 | $ 35.4 | $ 36.3 | $ 37.7
Reconciling items |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | $ 17.6 |  | $ 12.9 |  |  |

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