Loss per share - Schedule of EPS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Total net income (loss)	$ (136.7)	$ (36.5)
Weighted average number of common shares (in shares)	178.8	176.4
Effect of dilutive securities:
Dilutive number of shares (in shares)	178.8	176.4
Diluted earnings (loss) per share (in dollars per share)	$ (0.76)	$ (0.21)
Basic earnings (loss) per share (in dollars per share)	$ (0.76)	$ (0.21)
Stock options
Effect of dilutive securities:
Effect of dilutive securities, Stock options and Restricted share units (in shares)	0.0	0.0
Restricted share units
Effect of dilutive securities:
Effect of dilutive securities, Stock options and Restricted share units (in shares)	0.0	0.0