s&p/tsx composite index

Global markets turned lower as investors braced for a week packed with central bank meetings and corporate earnings, and also weighed a diplomatic impasse in U.S.-Iran negotiations. Wall Street futures were mixed after the S&P 500 and the Nasdaq notched their latest in a series of record closing highs yesterday. TSX futures were in the red ahead of the federal government’s economic update this afternoon. In Canada, investors are getting results from Aecon Group Inc. and Toromont Industries Ltd. On Wall Street, markets are watching earnings from Coca-Cola Co., Novartis AG, Visa Inc., General Mo