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Reserves for Losses and Adjustment Expenses - Reconciliation of Beginning and Ending Consolidated Loss and Loss Adjustment Expenses (LAE) Reserves (Details) - USD ($) $ in Millions |  | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 10, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | May 30, 2022 | Mar. 02, 2020 | Dec. 31, 2019
Insurance [Abstract] |  |  |  |  |  |  |  |  |
Provision for losses and LAE, beginning balance |  | $ 7,710.9 | $ 7,611.8 | $ 7,611.8 | $ 7,165.3 | $ 6,951.8 |  |  |
Less reinsurance recoverable |  |  |  | (4,897.7) | (3,298.1) | (3,195.2) |  |  | $ (2,319.8)
Net losses and LAE reserves, beginning balance |  | 2,813.2 | 4,313.7 | 4,313.7 | 3,970.1 | 4,632.0 |  |  |
Movement in net provision for losses and LAE for claims incurred: |  |  |  |  |  |  |  |  |
Current year |  | 723.5 | 775.0 | 1,651.9 | 1,648.2 | 1,841.7 |  |  |
Prior years |  | (6.4) | (7.3) | 28.1 | 45.1 | (0.9) |  |  |
Total incurred |  | 717.1 | 767.7 | 1,680.0 | 1,693.3 | 1,840.8 |  |  |
Net Losses and LAE payments for claims incurred: |  |  |  |  |  |  |  |  |
Current year |  | (30.8) | (35.5) | (192.7) | (729.1) | (404.9) |  |  |
Prior years |  | (438.6) | (616.9) | (1,098.4) | (580.7) | (1,359.7) |  |  |
Total paid |  | (469.4) | (652.4) | (1,291.1) | (1,309.8) | (1,764.6) |  |  |
Foreign exchange (gains)/losses |  | 22.0 | (83.6) | (49.3) | (39.9) | 80.4 |  |  |
Net losses and LAE reserves, ending balance |  | 3,082.9 | 2,505.3 | 2,813.2 | 4,313.7 | 3,970.1 |  |  |
Plus reinsurance recoverable on unpaid losses at the end of the year |  | 4,658.0 | 5,006.5 | 4,897.7 | 3,298.1 | 3,195.2 |  |  |
Provision for losses and LAE at the end of the year |  | 7,740.9 | 7,511.8 | 7,710.9 | 7,611.8 | 7,165.3 |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Net loss and LAE expenses disposed (1) |  | 0.0 | 1,840.1 | 1,840.1 | 0.0 | 818.5 |  |  |
Reinsurance Contracts [Axis]: LPT |  |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Reinsurance recoverable total |  |  |  |  |  |  | $ 2,610.1 |  |
Insurance |  |  |  |  |  |  |  |  |
Insurance [Abstract] |  |  |  |  |  |  |  |  |
Provision for losses and LAE, beginning balance |  | 1,452.5 | 2,165.3 | 2,165.3 | 1,874.4 |  |  |  |
Net losses and LAE reserves, beginning balance |  | 1,452.5 | 2,165.3 | 2,165.3 | 1,874.4 |  |  |  |
Movement in net provision for losses and LAE for claims incurred: |  |  |  |  |  |  |  |  |
Prior years |  | 8.5 |  | 86.9 |  |  |  |  |
Net Losses and LAE payments for claims incurred: |  |  |  |  |  |  |  |  |
Net losses and LAE reserves, ending balance |  |  |  | 1,452.5 | 2,165.3 | 1,874.4 |  |  |
Provision for losses and LAE at the end of the year |  | 1,641.7 | $ 1,314.9 | $ 1,452.5 | 2,165.3 | $ 1,874.4 |  |  |
Insurance | Reinsurance Contracts [Axis]: LPT, deferred gain |  |  |  |  |  |  |  |  |
Movement in net provision for losses and LAE for claims incurred: |  |  |  |  |  |  |  |  |
Prior years |  | 13.2 |  |  |  |  |  |  |
Insurance | Reinsurance Contracts [Axis]: LPT, offset post-LPT years |  |  |  |  |  |  |  |  |
Movement in net provision for losses and LAE for claims incurred: |  |  |  |  |  |  |  |  |
Prior years |  | $ 4.7 |  |  |  |  |  |  |
Surety Product Line | Insurance |  |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Net loss and LAE expenses disposed (1) |  |  |  |  | (42.0) |  |  |  |
Accident and Health Insurance Product Line |  |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Net loss and LAE expenses disposed (1) |  |  |  |  | $ (6.5) |  |  |  |
Enstar |  |  |  |  |  |  |  |  |
Net Losses and LAE payments for claims incurred: |  |  |  |  |  |  |  |  |
Plus reinsurance recoverable on unpaid losses at the end of the year |  |  |  |  |  |  |  | $ 770.0 |
Enstar | Reinsurance Contracts [Axis]: LPT losses reinsured] |  |  |  |  |  |  |  |  |
Net Losses and LAE payments for claims incurred: |  |  |  |  |  |  |  |  |
Plus reinsurance recoverable on unpaid losses at the end of the year |  |  |  |  |  |  |  | $ 3,120.0 |
Enstar | Reinsurance Contracts [Axis]: LPT net losses reinsured |  |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Event | $ 3,120.0 |  |  |  |  |  |  |  |

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