Business Operations	12 Months Ended
	Dec. 31, 2020
Corporate Information And Statement Of IFRS Compliance [Abstract]
Business Operations	Business Operations Fairfax Financial Holdings Limited (“the company” or “Fairfax”) is a holding company which, through its subsidiaries, is engaged in property and casualty insurance and reinsurance and the associated investment management. The holding company is federally incorporated and domiciled in Ontario, Canada.