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Loss per common share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Numerator:      
Net loss $ (190.6) $ (760.5) $ (211.6)
Denominator:      
Weighted-average number of shares-basic (in shares) 53.0 51.2 50.1
Dilutive securities-equity awards (in shares) 0.0 0.0 0.0
Weighted-average number of shares-diluted (in shares) 53.0 51.2 50.1
Net loss per common share - basic (in dollars per share) $ (3.60) $ (14.85) $ (4.22)
Net loss per common share - diluted (in dollars per share) $ (3.60) $ (14.85) $ (4.22)
Anti-dilutive stock awards (in shares) 4.9 3.6 2.8