A Study of Ixekizumab (LY2439821) in Children With Juvenile Idiopathic Arthritis Categories of Enthesitis-related Arthritis (Including Juvenile Onset Ankylosing Spondylitis) and Juvenile Psoriatic Arthritis

Inclusion Criteria: * Participants must have active juvenile idiopathic arthritis (categories of enthesitis related arthritis or juvenile psoriatic arthritis) * Participants must have weight of at least 10 kilograms (Kg), age starting at 2 years for participants with juvenile psoriatic arthritis and starting at 6 years for participants with enthesitis related arthritis * Participants must have all immunizations up-to-date in agreement with current immunization guidelines, in the opinion of the investigator Exclusion Criteria: * Participants must not have active or history of inflammatory bowel disease * Participants must not have active uveitis * Participants must not have active or latent tuberculosis * Participants must not have an active infection * Participants must not have concurrent use of biologic agents for the treatment of the juvenile idiopathic arthritis