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Document and Entity Information
 9 Months Ended
Sep. 30, 2017
shares
Document and Entity Information [Abstract]  
Document Type 10-Q
Amendment Flag false
Document Period End Date Sep. 30, 2017
Document Fiscal Year Focus 2017
Document Fiscal Period Focus Q3
Trading Symbol AHL
Entity Registrant Name ASPEN INSURANCE HOLDINGS LTD
Entity Central Index Key 0001267395
Current Fiscal Year End Date --12-31
Entity Filer Category Large Accelerated Filer
Entity Common Stock, Shares Outstanding 59,407,323