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Capital Structure - Summary of Authorized and Issued Share Capital (Details)(Phantom) - $ / shares	Sep. 30, 2024	Dec. 31, 2023	Dec. 31, 2022	Aug. 13, 2019	Sep. 20, 2016	May 02, 2013
Class of Stock [Line Items]
Ordinary shares, par value	$ 0.01	$ 0.01	$ 0.01
Preference shares, par value	0.0015144558	0.0015144558
5.950% Preference Shares (AHL PRC)
Class of Stock [Line Items]
Preference shares, par value	0.0015144558	0.0015144558	0.0015144558
Redemption price per share						$ 25
5.625% Preference Shares (AHL PRD)
Class of Stock [Line Items]
Preference shares, par value	0.0015144558	0.0015144558	0.0015144558
Redemption price per share	25	25	25		$ 25
5.625% Preference Shares, rep by Dep Shares (AHL PRE)
Class of Stock [Line Items]
Preference shares, par value	0.0015144558	0.0015144558	0.0015144558
Redemption price per share	$ 25	$ 25	$ 25	$ 25
Depositary share interest	0.10%	0.10%	0.10%

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