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Dividends - 6K - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Earnings Per Share [Abstract]          
Dividends paid on ordinary shares $ 175.0 $ 20.0 $ 40.3 $ 40.0 $ 0.0
Dividends paid on preference shares $ 41.1 $ 36.0 $ 49.9 $ 44.6 $ 44.5