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SCHEDULE VI SUPPLEMENTAL INFORMATION FOR PROPERTY AND CASUALTY INSURANCE UNDERWRITERS (Details) - Ark - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
SUPPLEMENTAL INFORMATION FOR PROPERTY AND CASUALTY INSURANCE UNDERWRITERS    
Deferred acquisition costs $ 127.2 $ 100.8
Reserves for Unpaid Claims and Claims Adjustment Expenses 1,296.5 894.7
Discount, if any, deducted in Column C 0.0 0.0
Unearned Premiums 623.2 495.9
Earned Premiums 1,043.4 637.3
Net investment income 16.3 2.9
Current Year 588.1 336.3
Prior Year (51.7) (21.5)
Amortization
of deferred
policy acquisition costs 238.3 111.3
Paid Claims and Claims Adjustment Expenses 257.5 0.0
Premiums written $ 1,195.2 $ 859.1