Common stock and additional paid-in capital - Schedule of Stockholders' Equity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, common shares, outstanding (in shares)	22,300,000
Beginning balance, equity	$ 376.4	$ 501.6
Exercise of stock options (in shares)	10,086	197,678
Stock-based compensation - RSUs	$ 8.7	$ 9.8
Stock-based compensation - options	0.1	3.6
Payment to the holders of non-controlling interest in subsidiary		$ (0.6)
Issuance of common stock in connection with the ATM Program	$ 15.5
Ending balance, common shares, outstanding (in shares)	30,400,000	22,300,000
Ending balance, equity	$ 263.1	$ 376.4
Number of common shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, common shares, outstanding (in shares)	22,300,000	22,000,000.0
Settlement of RSUs (in shares)	900,000	100,000
Exercise of stock options (in shares)		200,000
Issuance of common stock in connection with the ATM Program (in shares)	7,200,000
Ending balance, common shares, outstanding (in shares)	30,400,000	22,300,000
Common stock and additional paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, equity	$ 648.3	$ 635.3
Stock-based compensation - RSUs	8.7	9.8
Stock-based compensation - options	0.1	3.6
Payment to the holders of non-controlling interest in subsidiary		(0.4)
Issuance of common stock in connection with the ATM Program	15.5
Ending balance, equity	$ 672.7	$ 648.3