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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Earnings Per Share [Abstract]      
Net income $ 534.7 $ 51.1 $ 29.8
Preference share dividends (49.9) (44.6) (44.5)
Net income/(loss) available to Aspen Insurance Holdings Limited’s ordinary shareholders $ 484.8 $ 6.5 $ (14.7)
Basic and diluted weighted average ordinary shares outstanding 60,395,839 60,395,839 60,395,839
Earnings Per Share, Diluted $ 8.03 $ 0.11 $ (0.24)
Earnings Per Share, Basic $ 8.03 $ 0.11 $ (0.24)