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Net Income (Loss) Per Basic and Diluted Share - Basic and Diluted Per Share Computations for Net Income (Loss) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Numerator:        
Net income (loss) attributable to common stockholders – basic $ 0.1 $ (0.5) $ (8.2) $ (9.5)
Net income (loss) attributable to common stockholders – diluted $ 0.1 $ (0.5) $ (8.2) $ (9.5)
Denominator:        
Weighted-average shares of common stock — basic (in shares) 77.4 77.5 77.5 76.7
Effect of dilutive stock options and restricted stock units (in shares) 1.9 0.0 0.0 0.0
Weighted-average shares of common stock — diluted (in shares) 79.3 77.5 77.5 76.7
Net income (loss) per share attributable to common stockholders:        
Basic (in dollars per share) $ 0.00 $ (0.01) $ (0.11) $ (0.12)
Diluted (in dollars per share) $ 0.00 $ (0.01) $ (0.11) $ (0.12)