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Income Taxes - Summary of Total Income Tax (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
Income Tax Disclosure [Abstract]
Income tax (benefit)/expense allocated to net income	$ 6.4	$ 5.2	$ 32.1	$ 41.4	$ (132.1)	$ (78.1)	$ 5.3
Income tax (benefit)/expense allocated to other comprehensive income					20.6	(23.9)	0.3
Total income tax (benefit)/expense					$ (111.5)	$ (102.0)	$ 5.6

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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