Income Taxes - Income Before Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Taxes [Line Items]
Income (loss) before income taxes	$ (499.6)	$ 175.3	$ 539.1
Domestic
Income Taxes [Line Items]
Income (loss) before income taxes	(382.6)	295.3	606.0
Foreign
Income Taxes [Line Items]
Income (loss) before income taxes	$ (117.0)	$ (120.0)	$ (66.9)

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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+ Details