Inclusion Criteria- Diagnosis of type 2 diabetes mellitus
- Is receiving monotherapy or combination antidiabetic therapy with a glycosylated hemoglobin level between 6.5% and 11.0%, inclusive, at Screening (between 7.0 and 11.0%, inclusive, if the participant's antidiabetic regimen includes insulin)
- Diagnosis of acute coronary syndrome within 15 to 90 days prior to randomization.
Exclusion Criteria- Signs of type 1 diabetes mellitus
- Currently receiving a glucagon-like peptide-1 analogue for glycemic control of type 2 diabetes mellitus at Screening
- Received a dipeptidyl peptidase-4 inhibitor for either more than 14 days total or within the 3 months prior to Screening.