Zephyrus II: Efficacy and Safety Study of Pamrevlumab in Participants With Idiopathic Pulmonary Fibrosis (IPF)

The intent of this study is to evaluate the efficacy and safety of pamrevlumab as monotherapy in participants with IPF. Participants who are not being treated with approved IPF therapies (that is, nintedanib or pirfenidone) may be eligible for screening. Examples of reasons participants may not be treated with approved IPF therapies include but are not limited to: * Intolerant or not responsive to approved IPF therapies * Ineligible to receive these therapies * Participant voluntarily declines to receive approved IPF therapies after being fully informed of the potential benefits/risks NOTE: No participant should discontinue an approved IPF therapy for the purpose of enrolling in this study. During the 48-week treatment phase of the study, co-administration of an approved IPF therapy (such as, pirfenidone or nintedanib) is acceptable if clinically indicated in the Investigator's opinion, after assessment of potential risks/benefits of such combination with blinded study treatment. Participants who complete the 48-week study will be eligible for an optional, open-label extension phase with continued access to pamrevlumab, regardless of their randomized assignment.