Net Loss Per Share - Basic and Diluted Loss per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net loss	$ (191.0)	$ (119.3)	$ (70.3)
Weighted average common shares outstanding - basic (in shares)	50.0	39.5	32.9
Weighted average common shares outstanding - diluted (in shares)	50.0	39.5	32.9
Net loss per common share - basic (in usd per share)	$ (3.82)	$ (3.02)	$ (2.13)
Net loss per common share - diluted (in usd per share)	$ (3.82)	$ (3.02)	$ (2.13)