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Long-Duration Insurance Contracts - Reconciliation of Policyholder Account Balances to the Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Policyholder Account Balance [Line Items] |  |  |  |
Policyholders' account balances | $ 5,187.0 | $ 5,260.6 | [1] |
Indexed Universal Life |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholders' account balances | 57.8 | 47.6 |  | $ 39.1
Experience life |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholders' account balances | 61.2 | 64.3 |  | 66.2
Fixed Account Annuities |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholders' account balances | 4,556.0 | 4,591.1 |  | 4,532.7
Fixed Indexed Account Annuities |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholders' account balances | 449.0 | 510.3 |  | 522.6
SPIA (non-life contingent) |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholders' account balances | 32.6 | 34.4 |  | $ 37.7
Reconciling items |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholders' account balances | $ 30.4 | $ 12.9 |  |
[1] | Recast for the adoption of ASU 2018-12. See Note 1 of the Consolidated Financial Statements

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