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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parentheticals) - USD ($) $ in Millions				12 Months Ended
	Jan. 01, 2025	Nov. 29, 2024	May 02, 2013	Dec. 31, 2024	Dec. 31, 2023	Jan. 02, 2025	Nov. 26, 2024	Dec. 31, 2022	Aug. 13, 2019
Restricted cash				$ 181.9	$ 323.2			$ 232.1
Preference shares liquidation preference, value							$ 225.0		$ 250.0
5.950% Preference Shares (AHL PRC)
Preferred Stock, Shares Issued			11,000,000,000,000	11,000,000	11,000,000
Preferred Stock, Dividend Rate, Percentage		5.95%	5.95%	5.95%	5.95%
Preference shares liquidation preference, value			$ 275.0
5.950% Preference Shares (AHL PRC) | Subsequent Event
Preferred Stock, Dividend Rate, Percentage	5.95%
Preference shares liquidation preference, value						$ 275.0

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The percentage rate used to calculate dividend payments on preferred stock.

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Value of the difference between preference in liquidation and the par or stated values of the preferred shares.

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Number of shares issued for nonredeemable preferred shares and preferred shares redeemable solely at option of issuer. Includes, but is not limited to, preferred shares issued, repurchased, and held as treasury shares. Excludes preferred shares classified as debt.

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