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Liability for Unpaid Claims and CAE - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2020
Liability for Unpaid Claims and CAE |  |  |  |  |
Reinsurance Recoverables, Incurred but Not Reported Claims |  | $ 8,372.3 | $ 8,697.8 | $ 9,042.2 | $ 8,378.9
Phase 2 | Closed Block Individual Disability Reinsurance Transaction |  |  |  |  |
Liability for Unpaid Claims and CAE |  |  |  |  |
Increase in Benefits and Change in Reserves for Future Benefits | $ 133.1 | 133.1 |  |  |
Reinsurance Recoverables, Incurred but Not Reported Claims | $ 990.0 | $ 990.0 |  |  |

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