Net (loss) income per common share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net (loss) income per common share
Net (loss) income	$ (30)	$ 45	$ (37)	$ (39)
Weighted average number of common shares outstanding - basic (in shares)	74.0	72.2	73.6	68.5
Weighted dilutive effect of equity awards (in shares)		2.5
Weighted average number of common shares outstanding - diluted (in shares)	74.0	74.7	73.6	68.5
Basic net (loss) income per common share
Basic net (loss) income per common share (in dollars per share)	$ (0.41)	$ 0.62	$ (0.50)	$ (0.57)
Diluted net (loss) income per common share
Diluted net (loss) income per common share (in dollars per share)	$ (0.41)	$ 0.60	$ (0.50)	$ (0.57)