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, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Numerator:
Net loss attributable to common stockholder—basic	$ (43.4)	$ (43.9)	$ (79.2)	$ (106.3)
Net loss attributable to common stockholders—diluted	$ (43.4)	$ (43.9)	$ (79.2)	$ (106.3)
Denominator:
Weighted average common shares outstanding—basic (in shares)	76,983,877	73,433,379	76,647,656	73,178,708
Weighted average common shares outstanding—diluted (in shares)	76,983,877	73,433,379	76,647,656	73,178,708
Net loss per share attributable to common stockholders—basic (usd per share)	$ (0.56)	$ (0.60)	$ (1.03)	$ (1.45)
Net loss per share attributable to common stockholders—diluted (usd per share)	$ (0.56)	$ (0.60)	$ (1.03)	$ (1.45)