Income Taxes - Components of The Provision For Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Current income tax expense	$ (0.7)	$ (0.4)	$ (0.8)
Deferred income tax benefit (expense)	(62.1)	95.3	(24.6)
Income tax benefit (expense)	$ (62.8)	$ 94.9	$ (25.4)