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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Earnings Per Share [Abstract]      
Net income $ 486.1 $ 534.7 $ 51.1
Preference share dividends (54.9) (49.9) (44.6)
Net income available to Aspen Insurance Holdings Limited’s ordinary shareholders $ 431.2 $ 484.8 $ 6.5
Basic weighted average ordinary shares outstanding 90,833,333 90,833,333 90,833,333
Diluted weighted average ordinary shares outstanding 90,833,333 90,833,333 90,833,333
Basic earning per ordinary share (in usd per share) [1] $ 4.75 $ 5.34 $ 0.07
Diluted earnings per ordinary share (in usd per share) [1] $ 4.75 $ 5.34 $ 0.07
[1] The results of the March 30, 2025 Ordinary Shares Exchange have been applied retroactively for all periods.