Senior notes	3 Months Ended
Mar. 31, 2020
Debt Disclosure [Abstract]
Senior notes	On July 2, 2019, the Company completed a private offering of $175.0 million in aggregate principal amount of its 6.5% senior notes due July 2, 2029. Interest on the senior notes is paid semi-annually in arrears on each January 2 and July 2, which commenced on January 2, 2020. The $172.3 million net proceeds from the offering were used to redeem a portion of the Company’s outstanding preference shares, as described in Note 16, “Contingently redeemable preference shares”. Affiliates of ACGL purchased $35 million in aggregate principal amount of the senior notes. The senior notes are the Parent’s senior unsecured and unsubordinated obligations and rank equally with all of the other existing and future obligations of the Parent that are unsecured and unsubordinated. The Company may redeem the senior notes at any time, in whole or in part, prior to July 2, 2024, at “make-whole” redemption price, subject to BMA requirements. After July 2, 2024, the senior notes are redeemable, in whole or in part, at a redemption price equal to 100% of the principal amount, subject to BMA requirements. The indenture governing the senior notes contains certain customary covenants, including those related to the punctual payment of interest and principal amounts due. The Company was in compliance with such covenants at March 31, 2020. As of March 31, 2020, the carrying amount of the senior notes was $172.5 million, presented net of unamortized debt issuance costs of $2.5 million. As of December 31, 2019, the carrying amount of the senior notes was $172.4 million, presented net of unamortized debt issuance costs of $2.6 million.

On July 2, 2019, the Company completed a private offering of $175.0 million in aggregate principal amount of its 6.5% senior notes due July 2, 2029. Interest on the senior notes is paid semi-annually in arrears on each January 2 and July 2, which commenced on January 2, 2020. The $172.3 million net proceeds from the offering were used to redeem a portion of the Company’s outstanding preference shares, as described in Note 16, “Contingently redeemable preference shares”. Affiliates of ACGL purchased $35 million in aggregate principal amount of the senior notes.

The senior notes are the Parent’s senior unsecured and unsubordinated obligations and rank equally with all of the other existing and future obligations of the Parent that are unsecured and unsubordinated. The Company may redeem the senior notes at any time, in whole or in part, prior to July 2, 2024, at “make-whole” redemption price, subject to BMA requirements. After July 2, 2024, the senior notes are redeemable, in whole or in part, at a redemption price equal to 100% of the principal amount, subject to BMA requirements. The indenture governing the senior notes contains certain customary covenants, including those related to the punctual payment of interest and principal amounts due. The Company was in compliance with such covenants at March 31, 2020.

As of March 31, 2020, the carrying amount of the senior notes was $172.5 million, presented net of unamortized debt issuance costs of $2.5 million. As of December 31, 2019, the carrying amount of the senior notes was $172.4 million, presented net of unamortized debt issuance costs of $2.6 million.