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Cover Page - shares
 12 Months Ended
Dec. 31, 2024
Jan. 02, 2025
Document Information [Line Items]    
Document Type 20-F  
Document Registration Statement false  
Document Annual Report true  
Document Period End Date Dec. 31, 2024  
Current Fiscal Year End Date --12-31  
Document Transition Report false  
Document Shell Company Report false  
Entity File Number 001-31909  
Entity Registrant Name ASPEN INSURANCE HOLDINGS LIMITED  
Entity Incorporation, State or Country Code D0  
Entity Address, Address Line One 141 Front Street  
Entity Address, City or Town Hamilton  
Entity Address, Postal Zip Code HM19  
Entity Address, Country BM  
Entity Common Stock, Shares Outstanding (in shares)   60,395,839
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Emerging Growth Company false  
Entity Shell Company false  
Amendment Flag false  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus FY  
Entity Central Index Key 0001267395  
ICFR Auditor Attestation Flag false  
Document Accounting Standard U.S. GAAP  
Document Financial Statement Error Correction [Flag] false  
Business Contact    
Document Information [Line Items]    
Entity Address, Address Line One 141 Front Street  
Entity Address, City or Town Hamilton  
Contact Personnel Name Mark Cloutier  
Entity Address, Postal Zip Code HM19  
Entity Address, Country BM  
City Area Code 441  
Local Phone Number 295-8201  
5.625% Perpetual Non-Cumulative Preference Shares    
Document Information [Line Items]    
Title of 12(b) Security 5.625% Perpetual Non-Cumulative Preference Shares  
Trading Symbol AHL PRD  
Security Exchange Name NYSE  
Depositary Shares, each representing a 1/1000th interest in a share of 5.625% Perpetual Non-Cumulative Preference Shares    
Document Information [Line Items]    
Title of 12(b) Security Depositary Shares, each representing a 1/1000th interest in a share of 5.625% Perpetual Non-Cumulative Preference Shares  
Trading Symbol AHL PRE  
Security Exchange Name NYSE  
Depositary Shares, each representing a 1/1000th interest in a share of 7.00% Perpetual Non-Cumulative Preference Shares    
Document Information [Line Items]    
Title of 12(b) Security Depositary Shares, each representing a 1/1000th interest in a share of 7.00% Perpetual Non-Cumulative Preference Shares  
Trading Symbol AHL PRF  
Security Exchange Name NYSE