Net Loss Per Share - Reconciliation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Numerator:
Net loss attributable to common stockholders - basic	$ (74.8)	$ (49.0)
Net loss attributable to common stockholders - diluted	$ (74.8)	$ (49.0)
Denominator:
Weighted average common shares outstanding—basic (in shares)	61,698,568	60,218,652
Weighted average common shares outstanding—diluted (in shares)	61,698,568	60,218,652
Net loss per share attributable to common stockholders—basic (usd per share)	$ (1.21)	$ (0.81)
Net loss per share attributable to common stockholders—diluted (usd per share)	$ (1.21)	$ (0.81)