What are Canada's retaliatory tariffs on the US?

Canada's retaliatory tariffs took effect at 12.01am on Tuesday, imposing charges ranging from 15% to 50% on around $20bn worth of American goods entering Canada [1]. They form part of a broader escalation with Washington, which has since seen threats against Bombardier's US aircraft sales and a suspension of DOJ antitrust cooperation with Canada [1, 2, 3, 5].