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Transactions with Related Parties (Details) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2022 USD ($) director | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2017 USD ($) | Jan. 01, 2024 | Jul. 01, 2021 | Jan. 01, 2021 USD ($) | Dec. 31, 2019 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Purchases of other investments | $ 1,720,457,000 | $ 1,859,096,000 | $ 1,808,727,000 |  |  |  |  |
Net reserves | 13,753,118,000 | 12,157,925,000 | 12,199,074,000 |  |  |  |  | $ 9,809,192,000
Reinsurance recoverable for paid and unpaid claims and claims adjustments | 6,563,654,000 | 5,880,735,000 | 4,500,802,000 |  |  |  |  |
Ceded premiums written | 4,249,258,000 | 3,734,150,000 | 2,650,352,000 |  |  |  |  |
Reinsurance balances payable | 1,529,919,000 | 1,583,253,000 |  |  |  |  |  |
Net premiums written | 11,077,189,000 | 9,018,337,000 | 7,437,716,000 |  |  |  |  |
Net premiums earned | $ 9,678,077,000 | 8,082,298,000 | $ 6,991,935,000 |  |  |  |  |
Forecast |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Put Call Right To Sell Purchase Shares |  |  |  |  | 33.30% |  |  |
Greysbridge Holdings Ltd |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Percentage ownership |  |  |  |  |  | 40.00% |  |
Kelso And Company | Greysbridge Holdings Ltd |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Percentage ownership |  |  |  |  |  | 30.00% |  |
Premia Holdings Ltd |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Number of directors | director | 7 |  |  |  |  |  |  |
Warburg Pincus LLC | Greysbridge Holdings Ltd |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Percentage ownership |  |  |  |  |  | 30.00% |  |
Arch Re Bermuda And Affiliates | Premia Holdings Ltd |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Number of directors | director | 2 |  |  |  |  |  |  |
Equity Method Investee | Premia Holdings Ltd |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Percentage ownership |  |  |  | 25.00% |  |  |  |
Quota share agreement percentage | 25.00% |  |  |  |  |  |  |
Purchases of other investments |  |  |  | $ 100,000,000 |  |  |  |
Net premiums written | $ 121,100,000 | 40,400,000 |  |  |  |  |  |
Net premiums earned | 119,900,000 | 40,400,000 |  |  |  |  |  |
Funds Held under Reinsurance Agreements, Asset | 118,700,000 | 53,500,000 |  |  |  |  |  |
Equity Method Investee | Barbican |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Net reserves |  |  |  |  |  |  | $ 380,000,000 |
Reinsurance recoverable for paid and unpaid claims and claims adjustments | 0 | 0 |  |  |  |  |  |
Funds held liability | 0 | 0 |  |  |  |  |  |
Equity Method Investee | Somers Holdings Ltd. |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Reinsurance recoverable for paid and unpaid claims and claims adjustments | 1,200,000,000 | 902,800,000 |  |  |  |  |  |
Reinsurance balances payable | 413,800,000 | 258,400,000 |  |  |  |  |  |
Senior notes | $ 35,000,000 |  |  |  |  |  |  |
Preferred shares, dividend rate (as a percent) | 6.50% |  |  |  |  |  |  |
Net premiums written | $ 519,400,000 | $ 379,100,000 |  |  |  |  |  |

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