ITASCA, Ill., April 26, 2011 /PRNewswire/ -- Arthur J. Gallagher & Co. (NYSE: AJG) today reported its financial results for the quarter ended March 31, 2011 and will host a webcast conference call on Wednesday, April 27, 2011 at 9:00 a.m. ET/8:00 a.m. CT. Management will be referring