Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	1 Months Ended	2 Months Ended	3 Months Ended	7 Months Ended	9 Months Ended
	Aug. 11, 2023	Sep. 30, 2023	Sep. 30, 2022	Aug. 11, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Income Tax Expense (Benefit)	$ 94.1	$ (13.2)	$ 3.9	$ 90.4	$ 119.0