Comparison of a New Formulation of Insulin Glargine With Lantus in Patients With Type 2 Diabetes Mellitus on Basal Plus Mealtime Insulin

Primary Objective: * To compare the efficacy of insulin glargine new formulation and Lantus in terms of change in HbA1c from baseline to endpoint (scheduled month 6) in adult participants with type 2 diabetes mellitus Secondary Objectives: * To compare the efficacy of insulin glargine new formulation and Lantus in terms of occurrence of nocturnal Hypoglycemia

The maximum study duration was up to approximately 58 weeks per participant, consisting of: * up to 2 week screening period * 6-month comparative efficacy and safety treatment period * 6-month comparative safety extension period * 4-week safety follow-up period in a subset of participants * a 3-month administration substudy period starting after completion of the 6-month study period for participants willing to in a subset of participants randomized to HOE901-U300