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Shareholders' Equity - Narrative (Details) |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
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Dec. 29, 2023 $ / shares | Dec. 15, 2023 $ / shares | Nov. 01, 2023 shares | Sep. 29, 2023 $ / shares | Sep. 15, 2023 $ / shares | Jun. 30, 2023 $ / shares | Jun. 15, 2023 $ / shares | May 26, 2023 USD ($) $ / shares shares | Mar. 31, 2023 $ / shares | Mar. 15, 2023 $ / shares | Jul. 31, 2021 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) $ / shares shares | May 31, 2013 USD ($) $ / shares shares | Dec. 31, 2023 USD ($) period director $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) | Aug. 02, 2022 USD ($) | Aug. 11, 2021 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate authorized shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 325,000,000 |  |  |  |
Authorized common shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 225,000,000 |  |  |  |
Authorized preference shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |
Par value (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.00 | $ 1.00 |  |  |
Preference shares, issued, value | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 488,653,000 |  |
Preference shares, shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,000 | 30,000 |  |  |
Dividends declared per common share (in usd per share) | $ 0.38 | $ 0.38 |  | $ 0.38 | $ 0.38 |  | $ 0.38 |  |  | $ 0.38 |  |  |  |  |  |  |  |
Dividends paid per common share (in usd per share) |  |  |  |  |  | $ 0.38 |  |  | $ 0.38 |  |  |  |  |  |  |  |  |
Dividends on preference shares | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 35,375,000 | $ 35,375,000 | 33,266,000 |  |
Dividends on common shares | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 75,100,000 | $ 64,700,000 | $ 67,800,000 |  |
Validus |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | shares |  |  | 1,322,541 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued (in shares) | shares |  |  |  |  |  |  |  | 7,245,000 |  |  |  |  |  |  |  |  |  |
Sale of stock, price per share (in usd per share) |  |  |  |  |  |  |  | $ 192.00 |  |  |  |  |  |  |  |  |  |
Sale of stock, consideration received on transaction | $ |  |  |  |  |  |  |  | $ 1,352,000,000 |  |  |  |  |  |  |  |  |  |
Common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase program, authorized aggregate amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |
Share repurchase program, shares repurchased (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Share repurchase program, remaining authorized amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |
Series F Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 10,000 |  |  |  |  |  |
Proceeds from issuance of equity | $ |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |
Dividend rate, percentage |  |  |  |  |  |  |  |  |  |  |  | 5.75% |  | 5.75% |  |  |  |
Par value (in usd per share) |  |  |  |  |  |  |  |  |  |  |  | $ 1.00 |  |  |  |  |  |
Liquidation preference (in usd per share) |  |  |  |  |  |  |  |  |  |  |  | 25,000 |  |  |  |  |  |
Liquidation preference per annum (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,437.5 |  |  |  |
Quarterly liquidation preference (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 359.375 |  |  |  |
Series F Preferred Stock | Redemption period one |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price per share (in usd per share) |  |  |  |  |  |  |  |  |  |  |  | $ 25,000 |  |  |  |  |  |
Depositary Shares, each representing a 1/1,000th interest in a Series F 5.750% Preference Share, Par Value $1.00 per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |
Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage interest in underlying shares |  |  |  |  |  |  |  |  |  |  | 0.10% | 0.10% |  |  |  |  |  |
Depositary Shares | Redemption period one |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price per share (in usd per share) |  |  |  |  |  |  |  |  |  |  | $ 25.00 | $ 25.00 |  |  |  |  |  |
Series G Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 20,000 |  |  |  |  |  |  |
Proceeds from issuance of equity | $ |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |
Dividend rate, percentage |  |  |  |  |  |  |  |  |  |  | 4.20% |  |  | 4.20% |  |  |  |
Par value (in usd per share) |  |  |  |  |  |  |  |  |  |  | $ 1.00 |  |  |  |  |  |  |
Liquidation preference (in usd per share) |  |  |  |  |  |  |  |  |  |  | 25,000 |  |  |  |  |  |  |
Liquidation preference per annum (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,050 |  |  |  |
Quarterly liquidation preference (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 262.50 |  |  |  |
Series G Preferred Stock | Redemption period one |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price per share (in usd per share) |  |  |  |  |  |  |  |  |  |  | $ 25,000 |  |  |  |  |  |  |
Depositary Shares, each representing a 1/1,000th interest in a Series G 4.20% Preference Share, Par Value $1.00 per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right to elect directors, required number of dividend periods in arrears | period |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |
Right to elect directors, number of directors | director |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Series E Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.375% |  |  |  |
Par value (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 25 |  |  |  |  |
Preference shares, issued, value | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 275,000,000 |  |  |  |  |
Preference shares, shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 11,000,000 |  |  |  |  |
Preference shares, redemption amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 275,000,000
Preference shares, shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Liquidation preference per annum (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.34375 |  |  |  |
Quarterly liquidation preference (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.3359375 |  |  |  |
Series F Preferred Shares, Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidation preference per annum (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.4375 |  |  |  |
Quarterly liquidation preference (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.359375 |  |  |  |
Series G Preferred Shares, Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidation preference per annum (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.05 |  |  |  |
Quarterly liquidation preference (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.2625 |  |  |  |

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