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NONCONTROLLING INTERESTS - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
DaVinci Reinsurance    
Redeemable Noncontrolling Interest [Line Items]    
Noncontrolling interest, value subscribed $ 300,000 $ 275,000
Proceeds from noncontrolling interests 69,700  
Third-Party Investors    
Redeemable Noncontrolling Interest [Line Items]    
Redemption of shares from redeemable noncontrolling interests 225,900 123,300
DaVinci    
Redeemable Noncontrolling Interest [Line Items]    
Payments to noncontrolling interests 225,900 123,300
Proceeds from noncontrolling interests   300,000
Medici    
Redeemable Noncontrolling Interest [Line Items]    
Payments to noncontrolling interests 361,800 102,200
Proceeds from noncontrolling interests 163,600 531,400
Fontana    
Redeemable Noncontrolling Interest [Line Items]    
Noncontrolling interest, value subscribed 50,000  
Proceeds from noncontrolling interests 129,200 151,300
DaVinci    
Redeemable Noncontrolling Interest [Line Items]    
Noncontrolling interest, value subscribed   250,000
Redemption of shares from redeemable noncontrolling interests $ 406,849 123,272
DaVinci | Redeemable Noncontrolling Interest    
Redeemable Noncontrolling Interest [Line Items]    
Redeemable noncontrolling interest, redemption requirement, maximum percentage of shares held 50.00%  
DaVinci | Third-Party Investors    
Redeemable Noncontrolling Interest [Line Items]    
Noncontrolling interest, value subscribed   102,200
Payments to noncontrolling interests $ 180,600  
DaVinci | RenaissanceRe Holdings Ltd.    
Redeemable Noncontrolling Interest [Line Items]    
Noncontrolling interest, value subscribed   147,800
Payments to noncontrolling interests 69,400  
Medici    
Redeemable Noncontrolling Interest [Line Items]    
Noncontrolling interest, value subscribed 200,219 482,310
Redemption of shares from redeemable noncontrolling interests $ 406,644 107,549
Written notice period for redemption 30 days  
Medici | Third-Party Investors    
Redeemable Noncontrolling Interest [Line Items]    
Noncontrolling interest, value subscribed $ 250,200 527,300
Redemption of shares from redeemable noncontrolling interests 382,000 117,500
Payments of dividends 24,600  
Medici | RenaissanceRe Holdings Ltd.    
Redeemable Noncontrolling Interest [Line Items]    
Noncontrolling interest, value subscribed 50,600 45,200
Redemption of shares from redeemable noncontrolling interests 300 10,000
Vermeer    
Redeemable Noncontrolling Interest [Line Items]    
Noncontrolling interest, value subscribed 175,000 0
Vermeer | Stichting Pensioenfonds Zorg en Welzijn    
Redeemable Noncontrolling Interest [Line Items]    
Noncontrolling interest, value subscribed 175,000  
Payments of dividends 175,000 175,000
Fontana    
Redeemable Noncontrolling Interest [Line Items]    
Noncontrolling interest, value subscribed 100,000 51,316
Fontana | Third-Party Investors    
Redeemable Noncontrolling Interest [Line Items]    
Noncontrolling interest, value subscribed 100,000 75,000
Fontana | RenaissanceRe Holdings Ltd.    
Redeemable Noncontrolling Interest [Line Items]    
Noncontrolling interest, value subscribed $ 50,000 $ 23,700
Maximum | DaVinci    
Redeemable Noncontrolling Interest [Line Items]    
Share repurchase requests, limit 25.00%  
DaVinci Reinsurance    
Redeemable Noncontrolling Interest [Line Items]    
Noncontrolling ownership percentage 25.40% 27.80%
Medici    
Redeemable Noncontrolling Interest [Line Items]    
Noncontrolling ownership percentage 15.80% 11.70%
Vermeer | Medici | Voting, Non-participating Shares    
Redeemable Noncontrolling Interest [Line Items]    
Parent company ownership in redeemable noncontrolling interest 100.00%  
Vermeer | PFZW | Participating, Non-voting Common Shares    
Redeemable Noncontrolling Interest [Line Items]    
Parent company ownership in redeemable noncontrolling interest 100.00%  
Fontana    
Redeemable Noncontrolling Interest [Line Items]    
Noncontrolling ownership percentage 26.50% 31.60%