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Schedule II - Condensed Financial Information of Registrant Statements of Operations and Comprehensive Income (Details) - USD ($)
$ 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
Condensed Financial Statements, Captions [Line Items]              
Dividend income         $ 287.3 $ 198.4 $ 159.2
Other income         0.0 8.2 14.7
Total revenues $ 799.9 $ 749.2 $ 2,357.1 $ 2,202.1 2,966.1 2,890.0 2,628.9
Expenses              
General, administrative and corporate expenses (125.6) (120.1) (400.1) (352.8) (503.6) (494.2) (418.0)
Other expenses         0.0 (20.1) (10.8)
Income (loss) from operations before income taxes 63.1 91.5 269.6 346.6 402.6 (27.0) 35.1
Income tax benefit/(expense) (6.4) (5.2) (32.1) (41.4) 132.1 78.1 (5.3)
Net income/(loss) 56.7 86.3 237.5 305.2 534.7 51.1 29.8
Other Comprehensive Income:              
Change in unrealized (losses)/gains on investments         105.6 (367.8) (157.9)
Net change from current period hedged transactions         (14.0) 15.4 (6.2)
Other comprehensive (loss)/income, net of tax 130.2 (66.1) 113.3 (52.1) 106.0 (383.3) (142.7)
Total comprehensive (loss)/income attributable to Aspen Insurance Holdings Limited's ordinary shareholders $ 186.9 $ 20.2 $ 350.8 $ 253.1 640.7 (332.2) (112.9)
Parent Company              
Condensed Financial Statements, Captions [Line Items]              
Equity in net earnings/(losses) of subsidiaries and other investments, equity method         304.7 14.2 (90.5)
Dividend income         364.4 121.7 193.0
Net realized and unrealized investment (losses)/gains         1.1 (4.0) (0.5)
Other income         3.2 1.0 0.0
Total revenues         673.4 132.9 102.0
Expenses              
General, administrative and corporate expenses         (121.3) (62.7) (54.6)
Interest expense         (15.6) (14.3) (14.3)
Other expenses         (1.8) (4.8) (3.3)
Income (loss) from operations before income taxes         534.7 51.1 29.8
Income tax benefit/(expense)         0.0 0.0 0.0
Net income/(loss)         534.7 51.1 29.8
Other Comprehensive Income:              
Change in unrealized (losses)/gains on investments         105.6 (367.8) (158.6)
Change in foreign currency translation adjustment         14.4 (30.9) 21.4
Other comprehensive (loss)/income, net of tax         106.0 (383.3) (143.4)
Total comprehensive (loss)/income attributable to Aspen Insurance Holdings Limited's ordinary shareholders         $ 640.7 $ (332.2) $ (113.6)