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Long-Duration Insurance Contracts - Reconciliation of Policyholder Account Balances to the Balance Sheet (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | $ 5,128.6 |  | $ 5,187.0 |  |  |
Indexed Universal Life Insurance |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | 67.4 | $ 65.2 | 57.8 | $ 54.7 | $ 52.0 | $ 47.6
Experience Life Insurance |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | 58.8 | 59.4 | 61.2 | 62.1 | 63.0 | 64.3
Fixed Annuity |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | 4,525.6 | 4,509.5 | 4,556.0 | 4,568.5 | 4,563.5 | 4,591.1
Indexed Annuity |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | 413.6 | 426.6 | 449.0 | 468.0 | 481.2 | 510.3
Non-Life Contingent Single-Premium Immediate Annuity Insurance |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | 30.1 | $ 30.4 | 32.6 | $ 33.1 | $ 33.5 | $ 34.4
Reconciling items |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | $ 33.1 |  | $ 30.4 |  |  |

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