Net Loss per Share - Basic and Diluted Net Loss per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Numerator:
Net loss attributable to common stockholder—basic	$ (43.9)	$ (57.2)	$ (106.3)	$ (104.5)
Net loss attributable to common stockholders—diluted	$ (43.9)	$ (57.2)	$ (106.3)	$ (104.5)
Denominator:
Weighted average common shares outstanding—basic (in shares)	73,433,379	70,721,227	73,178,708	70,502,856
Weighted average common shares outstanding—diluted (in shares)	73,433,379	70,721,227	73,178,708	70,502,856
Net loss per share attributable to common stockholders—basic (usd per share)	$ (0.60)	$ (0.81)	$ (1.45)	$ (1.48)
Net loss per share attributable to common stockholders—diluted (usd per share)	$ (0.60)	$ (0.81)	$ (1.45)	$ (1.48)