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Share Transactions	6 Months Ended
Share Transactions	Jun. 30, 2024
Stockholders' Equity Note [Abstract]
Share transactions	Share Repurchases The Board of Directors of Arch Capital has authorized the investment in Arch Capital’s common shares through a share repurchase program. At June 30, 2024, $1.0 billion of share repurchases were available under the program. Repurchases under the program may be effected from time to time in open market or privately negotiated transactions through December 31, 2024. The timing and amount of the repurchase transactions under this program will depend on a variety of factors, including market conditions and corporate and regulatory considerations.