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SHAREHOLDERS’ EQUITY - Narrative (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Nov. 01, 2023
shares
May 26, 2023
USD ($)
$ / shares
shares
Jul. 31, 2021
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Dec. 31, 2024
USD ($)
period
director
$ / shares
shares
Sep. 30, 2024
$ / shares
Jun. 30, 2024
$ / shares
Mar. 31, 2024
$ / shares
Dec. 31, 2024
USD ($)
period
director
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
Dec. 31, 2022
USD ($)
Nov. 06, 2024
USD ($)
Class of Stock [Line Items]                        
Aggregate authorized shares (in shares) | shares         325,000,000       325,000,000      
Authorized common shares (in shares) | shares         225,000,000       225,000,000      
Authorized preference shares (in shares) | shares         100,000,000       100,000,000      
Par value (in usd per share)         $ 1.00       $ 1.00 $ 1.00    
Dividends declared per common share (in usd per share)         0.39 $ 0.39 $ 0.39 $ 0.39        
Dividends on preference shares | $                 $ 35,375,000 $ 35,375,000 $ 35,375,000  
Dividends on common shares | $                 $ 80,800,000 $ 75,100,000 $ 64,700,000  
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                    
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       $ 1,437.5      
Quarterly liquidation preference (in usd per share)         359.375       $ 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       $ 1,050      
Quarterly liquidation preference (in usd per share)         $ 262.50       $ 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       6      
Right to elect directors, number of directors | director         2       2      
Series F Preferred Shares, Depositary Shares                        
Class of Stock [Line Items]                        
Liquidation preference per annum (in usd per share)         $ 1.4375       $ 1.4375      
Quarterly liquidation preference (in usd per share)         0.359375       0.359375      
Series G Preferred Shares, Depositary Shares                        
Class of Stock [Line Items]                        
Liquidation preference per annum (in usd per share)         1.05       1.05      
Quarterly liquidation preference (in usd per share)         $ 0.2625       $ 0.2625      
Common shares                        
Class of Stock [Line Items]                        
Share repurchase program, authorized aggregate amount | $                       $ 750,000,000.0
Share repurchase program, shares repurchased (in shares) | shares                 2,711,234      
Value of shares repurchased | $                 $ 677,600,000      
Shares repurchased, average price per share (in usd per share)                 $ 249.93      
Remaining authorized repurchase amount | $         $ 287,700,000       $ 287,700,000