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Share Transactions	6 Months Ended
Share Transactions	Jun. 30, 2020
Stockholders' Equity Note [Abstract]
Share Transactions	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. Since the inception of the share repurchase program, Arch Capital has repurchased 388.9 million common shares for an aggregate purchase price of $4.04 billion. For the six months ended June 30, 2020, Arch Capital repurchased 2.6 million shares under the share repurchase program with an aggregate purchase price of $75.5 million. Arch Capital repurchased 0.1 million shares under the share repurchase program with an aggregate purchase price of $2.9 million during the six months ended June 30, 2019. At June 30, 2020, $924.5 million of share repurchases were available under the program, which may be effected from time to time in open market or privately negotiated transactions through December 31, 2021. 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. Depending upon results of operations, market conditions and the development of the economy, as well as other factors, generally Arch Capital will consider share repurchases on an opportunistic basis from time to time. During the 2020 second quarter, Arch Capital has not repurchased any shares under our share repurchase program and we do not expect to repurchase any shares for the remainder of 2020.