Net Loss per Share - Reconciliation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Numerator:
Net loss attributable to common stockholder—basic	$ (67.2)	$ (67.9)	$ (133.0)	$ (142.7)
Net loss attributable to common stockholders—diluted	$ (67.2)	$ (67.9)	$ (133.0)	$ (142.7)
Denominator:
Weighted average common shares outstanding—basic (in shares)	69,534,731	61,816,225	69,434,971	61,757,722
Weighted average common shares outstanding—diluted (in shares)	69,534,731	61,816,225	69,434,971	61,757,722
Net loss per share attributable to common stockholders—basic (usd per share)	$ (0.97)	$ (1.10)	$ (1.92)	$ (2.31)
Net loss per share attributable to common stockholders—diluted (usd per share)	$ (0.97)	$ (1.10)	$ (1.92)	$ (2.31)