XML 115 R1.htm IDEA: XBRL DOCUMENT v3.20.1
Document and Entity Information - shares
 12 Months Ended
Dec. 31, 2019
Mar. 06, 2020
Document Document And Entity Information [Abstract]    
Document Type 20-F  
Document Annual Report true  
Document Transition Report false  
Document Shell Company Report false  
Amendment Flag false  
Document Period End Date Dec. 31, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus FY  
Entity Registrant Name ASPEN INSURANCE HOLDINGS LTD  
Entity Central Index Key 0001267395  
Current Fiscal Year End Date --12-31  
Entity Well-known Seasoned Issuer No  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Voluntary Filers No  
Entity Filer Category Non-accelerated Filer  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   60,395,839