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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, 2022	Mar. 31, 2021
Basic and diluted net loss per share:
Net loss attributable to common stockholders, basic	$ (38.5)	$ (64.0)
Net loss attributable to common stockholders, diluted	$ (38.5)	$ (64.0)
Weighted average number of shares outstanding:
Common stock (in shares)	211.4	204.6
Number of shares used in per share computations (in shares)	211.4	204.6
Net loss per share, basic (in dollars per share)	$ (0.18)	$ (0.31)
Net loss per share, diluted (in dollars per share)	$ (0.18)	$ (0.31)

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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