Document and Entity Information - USD ($)
$ in Billions
12 Months Ended
Dec. 31, 2018
Feb. 11, 2019
Jun. 30, 2018
Document And Entity Information      
Entity Registrant Name Laredo Petroleum, Inc.    
Entity Central Index Key 0001528129    
Document Type 10-K    
Document Period End Date Dec. 31, 2018    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   233,924,462  
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Entity voluntary filer No    
Entity well known seasoned issuer Yes    
Entity public float     $ 1.5