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Schedule VI - Supplementary Information For Property and Casualty Insurance Underwriters
 12 Months Ended
Dec. 31, 2020
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract]  
Supplementary Information for Property and Casualty Insurance Underwriters
SCHEDULE VI
ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES
SUPPLEMENTARY INFORMATION FOR PROPERTY AND CASUALTY INSURANCE UNDERWRITERS
(U.S. dollars in thousands)
Column AColumn BColumn CColumn DColumn EColumn FColumn GColumn HColumn IColumn JColumn K
Affiliation with RegistrantDeferred Acquisition CostsReserves for Losses and Loss Adjustment ExpensesDiscount, if any, deducted in Column CUnearned PremiumsNet
Premiums Earned		Net Investment IncomeNet Losses and Loss Adjustment Expenses Incurred Related toAmortization
of Deferred Acquisition Costs		Net Paid Losses and Loss Adjustment ExpensesNet
Premiums Written
(a) Current Year(b)
Prior Years
Consolidated Subsidiaries
2020$790,708 $16,513,929 $23,326 $4,838,965 $6,991,935 $519,608 $4,851,051 $(161,452)$1,004,842 $2,661,117 $7,437,716 
2019633,400 13,891,842 22,012 4,339,549 5,786,498 627,738 3,297,037 (163,585)840,945 2,383,255 6,039,067 
2018569,574 11,853,297 21,145 3,753,636 5,231,975 563,633 3,162,818 (272,712)805,135 2,206,164 5,346,747