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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Earnings Per Share [Abstract]              
Net (loss)/income $ 56.7 $ 86.3 $ 237.5 $ 305.2 $ 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 $ 42.9 $ 72.5 $ 196.4 $ 269.2 $ 484.8 $ 6.5 $ (14.7)
Basic and weighted average ordinary shares outstanding 60,395,839,000,000 60,395,839,000,000 60,395,839,000,000 60,395,839,000,000 60,395,839 60,395,839 60,395,839
Diluted earnings per ordinary share (in usd per share) $ 0.71 $ 1.20 $ 3.25 $ 4.46 $ 8.03 $ 0.11 $ (0.24)
Basic earnings per ordinary share (in usd per share) $ 0.71 $ 1.20 $ 3.25 $ 4.46 $ 8.03 $ 0.11 $ (0.24)