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SCHEDULE III - SUPPLEMENTARY INSURANCE INFORMATION (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
P&C Insurance and Reinsurance (Ark/WM Outrigger)      
SUPPLEMENTARY INSURANCE INFORMATION      
Deferred Acquisition Costs $ 211.1 $ 165.2 $ 145.3
Future Policy Benefits, Losses, Claims and Loss Expenses 2,481.0 2,127.5 1,605.1
Unearned Premiums 1,026.1 853.3 743.6
Other Policy Claims and Benefits Payable 0.0 0.0 0.0
Premiums Earned 1,697.4 1,587.8 1,409.7
Net Investment Income 106.5 90.7 61.4
Benefits, Claims, Losses and Settlement Expenses 844.2 855.8 726.8
Amortization of Deferred Acquisition Costs 374.4 294.1 273.1
Other Operating Expenses 143.9 136.1 113.6
Premiums Written 1,811.6 1,679.1 1,520.9
Financial Guarantee (HG Global)      
SUPPLEMENTARY INSURANCE INFORMATION      
Deferred Acquisition Costs 96.9 86.6 40.1
Future Policy Benefits, Losses, Claims and Loss Expenses 0.0 0.0 0.0
Unearned Premiums 327.9 297.3 325.8
Other Policy Claims and Benefits Payable 0.0 0.0 0.0
Premiums Earned 30.8 31.7 31.2
Net Investment Income 27.1 32.2 31.7
Benefits, Claims, Losses and Settlement Expenses 0.0 0.0 0.0
Amortization of Deferred Acquisition Costs 8.0 8.2 8.6
Other Operating Expenses 0.0 0.2 0.4
Premiums Written 61.4 56.0 $ 58.6
Bamboo Captive      
SUPPLEMENTARY INSURANCE INFORMATION      
Deferred Acquisition Costs 0.0 10.2  
Future Policy Benefits, Losses, Claims and Loss Expenses 0.0 17.8  
Unearned Premiums 0.0 31.5  
Other Policy Claims and Benefits Payable 0.0 0.0  
Premiums Earned 26.7 39.4  
Net Investment Income 1.8 1.4  
Benefits, Claims, Losses and Settlement Expenses 18.0 20.6  
Amortization of Deferred Acquisition Costs 9.7 14.1  
Other Operating Expenses 0.0 0.0  
Premiums Written 16.1 50.0  
Bamboo CRV      
SUPPLEMENTARY INSURANCE INFORMATION      
Deferred Acquisition Costs 2.5 5.8  
Future Policy Benefits, Losses, Claims and Loss Expenses 13.6 12.1  
Unearned Premiums 9.6 29.0  
Other Policy Claims and Benefits Payable 0.0 0.0  
Premiums Earned 22.2 32.7  
Net Investment Income 1.5 0.4  
Benefits, Claims, Losses and Settlement Expenses 20.0 12.1  
Amortization of Deferred Acquisition Costs 8.3 12.1  
Other Operating Expenses 0.0 0.0  
Premiums Written $ 1.4 $ 61.7