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Subsequent Event	9 Months Ended
Subsequent Event	Sep. 30, 2020
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On November 2, 2020, we announced that we had reached an agreement to sell our reinsurance business, Ariel Re, to Pelican Ventures and J.C. Flowers & Co. Ariel Re is one of the units within our International Operations reporting segment. The transaction is subject to regulatory approval and is expected to close in the fourth quarter of 2020. Under the terms of the agreement, the buying group’s corporate member will provide Ariel Re’s capital for the 2021 Lloyd’s year of account, and Argo Group has agreed to retain historical reserves and the remaining exposure for the 2020 Lloyd’s year of account.