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Transactions with Related Parties	6 Months Ended
Transactions with Related Parties	Jun. 30, 2017
Related Party Transactions [Abstract]
Transactions with Related Parties	Transactions with Related Parties Kewsong Lee, a director of ACGL, is a Managing Director and Deputy Chief Investment Officer for Corporate Private Equity of The Carlyle Group (“Carlyle”). As part of its investment philosophy, the Company invests a portion of its investment portfolio in alternative investment funds. As of June 30, 2017, the total value of the Company’s investments in funds or other investments managed by Carlyle was approximately $228.5 million, and the Company had aggregate unfunded commitments to funds managed by Carlyle of $493.0 million. The Company may make additional commitments to funds managed by Carlyle from time to time. During the six months ended June 30, 2017 and 2016, the Company made aggregate capital contributions to funds managed by Carlyle of $57.2 million and $56.6 million, respectively, and received aggregate cash distributions from funds managed by Carlyle of $38.3 million and $13.8 million, respectively.