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SCHEDULE VI - SUPPLEMENTAL INFORMATION CONCERNING PROPERTY AND CASUALTY INSURANCE OPERATIONS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
P&C Insurance and Reinsurance (Ark/WM Outrigger)      
SUPPLEMENTAL INFORMATION FOR PROPERTY AND CASUALTY INSURANCE UNDERWRITERS      
Current Year $ 956.9 $ 914.4 $ 706.9
Prior Year (112.7) (58.6) 19.9
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters, Consolidated Property and Casualty Insurance Entity | P&C Insurance and Reinsurance (Ark/WM Outrigger)      
SUPPLEMENTAL INFORMATION FOR PROPERTY AND CASUALTY INSURANCE UNDERWRITERS      
Deferred acquisition costs 211.1 165.2 145.3
Reserves for Unpaid Claims and Claims Adjustment Expenses 2,481.0 2,127.5 1,605.1
Discount, if any, deducted in Column C 0.0 0.0 0.0
Unearned Premiums 1,026.1 853.3 743.6
Earned Premiums 1,697.4 1,587.8 1,409.7
Net investment income 106.5 90.7 61.4
Current Year 956.9 914.4 706.9
Prior Year (112.7) (58.6) 19.9
Amortization
of deferred
policy acquisition costs 374.4 294.1 273.1
Paid Claims and Claims Adjustment Expenses 585.7 416.7 407.9
Net Premiums written 1,811.6 1,679.1 1,520.9
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters, Consolidated Property and Casualty Insurance Entity | Bamboo Captive      
SUPPLEMENTAL INFORMATION FOR PROPERTY AND CASUALTY INSURANCE UNDERWRITERS      
Deferred acquisition costs 0.0 10.2 0.0
Reserves for Unpaid Claims and Claims Adjustment Expenses 0.0 17.8 0.0
Discount, if any, deducted in Column C 0.0 0.0 0.0
Unearned Premiums 0.0 31.5 0.0
Earned Premiums 26.7 39.4 0.0
Net investment income 1.8 1.4 0.0
Current Year 16.0 17.3 0.0
Prior Year 2.0 3.3 0.0
Amortization
of deferred
policy acquisition costs 9.7 14.1 0.0
Paid Claims and Claims Adjustment Expenses 27.2 12.0 0.0
Net Premiums written 16.1 50.0 0.0
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters, Consolidated Property and Casualty Insurance Entity | Bamboo CRV      
SUPPLEMENTAL INFORMATION FOR PROPERTY AND CASUALTY INSURANCE UNDERWRITERS      
Deferred acquisition costs 2.5 5.8 0.0
Reserves for Unpaid Claims and Claims Adjustment Expenses 13.6 12.1 0.0
Discount, if any, deducted in Column C 0.0 0.0 0.0
Unearned Premiums 9.6 29.0 0.0
Earned Premiums 22.2 32.7 0.0
Net investment income 1.5 0.4 0.0
Current Year 16.2 12.1 0.0
Prior Year 3.8 0.0 0.0
Amortization
of deferred
policy acquisition costs 8.3 12.1 0.0
Paid Claims and Claims Adjustment Expenses 16.4 0.0 0.0
Net Premiums written $ 1.4 $ 61.7 $ 0.0