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SCHEDULE IV - REINSURANCE (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Premiums earned      
Gross Amount   $ 15.8 $ 28.7
Assumed   15.9 2.5
Net earned premiums $ 1,777.1 1,691.6 1,440.9
P&C Insurance and Reinsurance (Ark/WM Outrigger)      
Premiums earned      
Gross Amount 1,130.9 1,004.2 848.1
Ceded (632.4) (504.6) (364.0)
Assumed 1,198.9 1,088.2 925.6
Net earned premiums $ 1,697.4 $ 1,587.8 $ 1,409.7
Percentage of Amount Assumed to Net 70.60% 68.50% 65.70%
Financial Guarantee (HG Global)      
Premiums earned      
Gross Amount $ 0.0 $ 15.8 $ 28.7
Ceded 0.0 0.0 0.0
Assumed 30.8 15.9 2.5
Net earned premiums $ 30.8 $ 31.7 $ 31.2
Percentage of Amount Assumed to Net 100.00% 50.20% 8.00%
Bamboo Captive      
Premiums earned      
Gross Amount $ 0.0 $ 0.0  
Ceded (2.0) (4.0)  
Assumed 28.7 43.4  
Net earned premiums $ 26.7 $ 39.4  
Percentage of Amount Assumed to Net 107.50% 110.20%  
Bamboo CRV      
Premiums earned      
Gross Amount $ 0.0 $ 0.0  
Ceded 0.0 0.0  
Assumed 22.2 32.7  
Net earned premiums $ 22.2 $ 32.7  
Percentage of Amount Assumed to Net 100.00% 100.00%