Consolidated Statements of Change in Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Common Stock	Additional paid in capital	Accumulated Deficit	Accumulated other comprehensive income (loss)	Noncontrolling interest	Total
Balance at the beginning of period at Dec. 31, 2019		$ 1,784.0	$ (1,064.0)	$ 41.0	$ 1.0	$ 762.0
Balance at the beginning of period (in shares) at Dec. 31, 2019	59.9
Increase (Decrease) in Shareholders' Equity
Common stock issued under employee stock purchase plan		2.0				2.0
Common stock issued under employee stock purchase plan (in shares)	0.2
Equity classified stock-based compensation expense		4.0				4.0
Comprehensive loss			(48.0)	(63.0)		(111.0)
Balance at the end of period at Mar. 31, 2020		1,790.0	(1,112.0)	(22.0)	1.0	657.0
Balance at the end of period (in shares) at Mar. 31, 2020	60.1
Balance at the beginning of period at Dec. 31, 2020		1,818.0	(763.0)	(120.0)	1.0	$ 936.0
Balance at the beginning of period (in shares) at Dec. 31, 2020	61.2					61.2
Increase (Decrease) in Shareholders' Equity
Common stock issuance, net of transaction fees		380.0				$ 380.0
Common stock issuance, net of transaction fees (in shares)	10.0
Common stock issued under employee stock purchase plan		2.0				2.0
Common stock issued under employee stock purchase plan (in shares)	0.1
Equity classified stock-based compensation expense		7.0				7.0
Equity classified stock-based compensation expense (in shares)	0.4
Comprehensive loss			(84.0)	6.0		(78.0)
Balance at the end of period at Mar. 31, 2021		$ 2,207.0	$ (847.0)	$ (114.0)	$ 1.0	$ 1,247.0
Balance at the end of period (in shares) at Mar. 31, 2021	71.7					71.7