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Reserves for Losses and Adjustment Expenses - Reconciliation of Reinsurance Recoverables on Unpaid Losses (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | May 30, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Reinsurance recoverable for unpaid claims under retroactive reinsurance, beginning balance | $ 4,897.7 |  |
Reinsurance recoverable for unpaid claims under retroactive reinsurance, beginning balance, Ending Balance | 4,577.8 | $ 4,897.7 |
Provision for losses and LAE for claims incurred | 60.8 | 28.1 |
Reinsurance Contracts [Axis]: LPT |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Reinsurance recoverables, premium paid and recognized |  |  | $ 1,840.1
Reinsurance Contracts [Axis]: Retroactive Reinsurance |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Reinsurance recoverable for unpaid claims under retroactive reinsurance, beginning balance | 2,132.0 |  |
Reinsurance recoverable for unpaid claims under retroactive reinsurance, beginning balance, Ending Balance | $ 1,627.4 | $ 2,132.0 |

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