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Long-Duration Insurance Contracts - Reconciliation of Policyholder Account Balances to the Balance Sheet (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | $ 5,206.2 |  | $ 5,260.6 |  |  |
Indexed Universal Life |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | 52.0 | $ 49.9 | 47.6 | $ 42.6 | $ 41.0 | $ 39.1
Experience Life |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | 63.0 | 63.5 | 64.3 | 65.4 | 65.9 | 66.2
Fixed Account Annuities |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | 4,563.5 | 4,577.4 | 4,591.1 | 4,573.7 | 4,548.2 | 4,532.7
Fixed Indexed Account Annuities |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | 481.2 | 498.4 | 510.3 | 518.2 | 518.2 | 522.6
SPIA (non-life contingent) |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | 33.5 | $ 33.8 | 34.4 | $ 36.3 | $ 37.0 | $ 37.7
Reconciling items |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Policyholders' account balances | $ 13.0 |  | $ 12.9 |  |  |

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