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Net Loss Per Share - Computation of Basic and Diluted Net Income (Loss) per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Net loss per share:    
Net loss attributable to common stockholders $ (64.0) $ (48.2)
Common stock (in shares) 204.6 165.4
Number of shares used in per share computations (in shares) 204.6 165.4
Net loss per share (in usd per share) $ (0.31) $ (0.29)