Canada's main stock index fell Tuesday for a second straight day, hitting its lowest level since Dec. 7 as the declining price of oil dragged shares of energy companies down for the second day in a row.

The Toronto Stock Exchange's benchmark Standard & Poor's/TSX Composite Index fell 139.21 points, or 0.86 percent, to close the day at 15,955.51. Financials and telecoms were the only two sectors to rise among the Toronto index's 10 main groups.

The Canadian dollar edged up 0.04 cents to 0.8111 U.S. dollar.

The energy sector retreated 2.9 percent amid signs of rising U.S. crude output.

Suncor Energy fell 2.6 percent to 44.35 Canadian dollars while Canadian Natural Resources declined 2.5 percent to 42.57 Canadian dollars.

Thomson Reuters surged 7.1 percent to 57.37 Canadian dollars after sources said Blackstone Group was in advanced talks to buy a majority stake in a key Thomson Reuters unit.

Shaw Communications edged up 0.9 percent to 26.98 Canadian dollars.

Among the most active Canadian stocks by volume were Aurora Cannabis, dropping 10.3 percent to 11.62 Canadian. NGEx Resources rose 4.6 percent to 1.15 Canadian dollars and Bombardier fell 4.4 percent to 3.44 Canadian dollars.