Net Income (Loss) Per Share of Common Stock - Schedule of Computation of Basic and Diluted Net Income (Loss) Per Share of Common Stock (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Basic and Diluted:
Net income (loss) attributable to common stockholders	$ (24.5)	$ (23.0)
Weighted-average common shares outstanding	1,133.2	1,084.4
Net income (loss) per share attributable to common stockholders	$ (0.02)	$ (0.02)