Income Taxes - (Loss) Income Before Tax (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
United States	$ (240.3)	$ (123.6)	$ (109.5)
Foreign	6.7	2.8	1.6
Loss before income taxes	$ (233.6)	$ (120.8)	$ (107.9)