A Study to Evaluate the Pharmacokinetics, Efficacy and Safety of Intravenous Golimumab in Pediatric Participants With Active Polyarticular Course Juvenile Idiopathic Arthritis Despite Methotrexate Therapy

Golimumab 80 mg/m\^2 IV infusion at Weeks 0, 4, and every 8 weeks through Week 244. At Week 252, participants who meet the criteria for the optional Extended Treatment Period (ETP) may continue treatment with golimumab 80 mg/m\^2 every 8 weeks after completion of the Week 252 assessments.

Methotrexate BSA-based dose (10 to 30 mg/m\^2 per week for participants with BSA \<1.67 m\^2, or minimum of 15 mg/week for participants with BSA \>=1.67 m\^2) weekly at least through Week 28.