TORONTO, May 16 (Reuters) - Canada's main stock index finished lower on Tuesday, reversing earlier gains, as a retreat in financial and energy stocks dragged the market into negative territory.
The Toronto Stock Exchange's S&P/TSX composite index .GSPTSE fell 86.14 points, or 0.55 percent, to close at 15,543.33. All but three of the index's 10 key sectors declined.