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Subsequent Events (Details) - USD ($) |  | 2 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 01, 2024 | Feb. 21, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Feb. 01, 2024 | Jan. 31, 2024
DaVinci Holdings Ltd. | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Redeemable noncontrolling interest, ownership percentage |  | 23.90% |  |  |  |
Medici |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Redeemable noncontrolling interest, ownership percentage |  |  | 11.70% | 12.80% |  |
Medici | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Redeemable noncontrolling interest, ownership percentage |  |  |  |  | 11.40% |
Fontana | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Redeemable noncontrolling interest, ownership percentage | 26.50% |  |  |  |  |
DaVinci Holdings Ltd. | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Noncontrolling interest, increase from sale of parent equity interest | $ 300,000,000 |  |  |  |  |
Third-Party Investors |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Redemption of shares from redeemable noncontrolling interests |  |  | $ 123,300,000 | $ 161,600,000 |  |
Third-Party Investors | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Redemption of shares from redeemable noncontrolling interests | 175,000,000 |  |  |  |  |
Fontana | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Noncontrolling interest, increase from sale of parent equity interest | 50,000,000 |  |  |  |  |
DaVinci Holdings Ltd. |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Redemption of shares from redeemable noncontrolling interests |  |  | 123,272,000 | 161,570,000 |  |
Noncontrolling interest, value subscribed |  |  | 250,000,000 | 500,000,000 |  |
DaVinci Holdings Ltd. | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Dividends payable |  | $ 250,000,000 |  |  |  |
DaVinci Holdings Ltd. | Third-Party Investors |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Noncontrolling interest, value subscribed |  |  | 102,200,000 | 284,800,000 |  |
DaVinci Holdings Ltd. | RenaissanceRe Holdings Ltd. |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Noncontrolling interest, value subscribed |  |  | 147,800,000 | 215,200,000 |  |
DaVinci Holdings Ltd. | RenaissanceRe Holdings Ltd. | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Dividends payable |  | 69,400,000 |  |  |  |
DaVinci Holdings Ltd. | Investor | Other liabilities |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Noncontrolling interest, value subscribed |  |  | 300,000,000 |  |  |
Medici |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Redemption of shares from redeemable noncontrolling interests |  |  | 107,549,000 | 100,234,000 |  |
Noncontrolling interest, value subscribed |  |  | 482,310,000 | 350,136,000 |  |
Medici | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Dividends payable |  |  |  |  |  | $ 18,400,000
Medici | Third-Party Investors |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Redemption of shares from redeemable noncontrolling interests |  |  | 117,500,000 |  |  |
Noncontrolling interest, value subscribed |  |  | 527,300,000 |  |  |
Medici | RenaissanceRe Holdings Ltd. |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Redemption of shares from redeemable noncontrolling interests |  |  | 10,000,000 |  |  |
Noncontrolling interest, value subscribed |  |  | 45,200,000 |  |  |
Medici | RenaissanceRe Holdings Ltd. | Preference shares | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Investment in variable interest entity |  | 500,000 |  |  |  |
Payments of capital distributions |  | 0 |  |  |  |
Medici | Investor | Preference shares |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Investment in variable interest entity |  |  | 75,000,000 |  |  |
Medici | Investor | Preference shares | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Investment in variable interest entity |  | 127,600,000 |  |  |  |
Payments of capital distributions |  | $ 35,600,000 |  |  |  |
Fontana | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Noncontrolling interest, value subscribed | 100,000,000 |  |  |  |  |
Fontana | Third-Party Investors | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Noncontrolling interest, value subscribed | 50,000,000 |  |  |  |  |
Fontana | RenaissanceRe Holdings Ltd. | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Noncontrolling interest, value subscribed | $ 50,000,000 |  |  |  |  |
Fontana | Investor | Other liabilities |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Noncontrolling interest, value subscribed |  |  | 100,000,000 |  |  |
Vermeer Reinsurance Ltd. |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Redemption of shares from redeemable noncontrolling interests |  |  | 175,000,000 | 0 |  |
Noncontrolling interest, value subscribed |  |  | $ 0 | $ 250,000,000 |  |
Vermeer Reinsurance Ltd. | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Dividends payable |  |  |  |  |  | $ 175,000,000

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