v3.26.1
Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Earnings Per Share [Abstract]        
Net income $ 340.2 $ 486.1 $ 534.7  
Less: Preference share dividends (45.5) (54.9) (49.9)  
Less: Preference share redemption costs (4.4) 0.0   $ 0.0
Net income available to Aspen Insurance Holdings Limited’s ordinary shareholders $ 290.3 $ 431.2 $ 484.8  
Basic weighted average ordinary shares outstanding 91,375,776 90,833,333 90,833,333  
Weighted average effect of dilutive restricted share units 158,644 0 0  
Diluted weighted average ordinary shares outstanding 91,534,420 90,833,333 90,833,333  
Basic earnings per ordinary share (5) [1] $ 3.18 $ 4.75 $ 5.34  
Diluted earnings per ordinary share (5) [1] $ 3.17 $ 4.75 $ 5.34  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 616,762,000,000 0 0  
[1] Basic and diluted earnings per ordinary share have been retroactively adjusted to reflect the impact of the Ordinary Share Exchange, for all periods presented. Refer to Note 12, “Capital Structure” and Note 13, “Earnings Per Ordinary Share” for further details.