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Subsequent Event	12 Months Ended
Subsequent Event	Dec. 31, 2019
Subsequent Events [Abstract]
Subsequent event	Subsequent Event On February 25, 2020, the Company announced that it has entered into a share purchase agreement with Natixis to purchase a 29.5% stake in Coface, a France-based leader in the global trade credit insurance market. The transaction will be completed at a price of €10.70 per share (dividend until closing attached), corresponding to a transaction value of approximately €480 million based on the current number of shares. As part of the transaction, Natixis’ seven representatives on Coface’s board of directors will resign and be replaced by four Arch nominees. Among other things, this transaction remains subject to antitrust and regulatory approvals, including in particular, approval by the French prudential regulator, the Autorité de Controle Prudentiel et de Résolution.