Income Taxes - Income Before Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Taxes [Line Items]
Income (loss) before income taxes	$ 539.1	$ (834.2)	$ 86.1
Domestic
Income Taxes [Line Items]
Income (loss) before income taxes	606.0	(834.0)	85.5
Foreign
Income Taxes [Line Items]
Income (loss) before income taxes	$ (66.9)	$ (0.2)	$ 0.6