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Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share (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
Basic and diluted net loss per share:        
Net loss attributable to common stockholders, basic $ (186.6) $ (226.6) $ (802.2) $ (865.8)
Net loss attributable to common stockholders, diluted $ (186.6) $ (226.6) $ (802.2) $ (865.8)
Weighted average shares outstanding:        
Common stock (in shares) 226.4 216.0 223.6 214.8
Number of shares used in per share computations (in shares) 226.4 216.0 223.6 214.8
Net loss per share, basic (in dollars per share) $ (0.82) $ (1.05) $ (3.59) $ (4.03)
Net loss per share, diluted (in dollars per share) $ (0.82) $ (1.05) $ (3.59) $ (4.03)