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Net Loss Per Share Attributable to Common Stockholders - Schedule of Computation of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Numerator:    
Net loss attributable to common stockholders $ (212.4) $ (132.7)
Denominator:    
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic and diluted 126,917,284 108,764,426
Net loss per share attributable to common stockholders, basic and diluted $ (1.67) $ (1.22)