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Earnings Per Ordinary 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 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      
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)