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Net income (loss) per common share (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Earnings Per Share [Abstract]      
Adjustment for potential dilutive effect of dilutive securities (in shares) 0 0  
Numerator:      
Net income (loss) $ (760.5) $ (211.6) $ 219.5
Denominator:      
Weighted-average number of shares-basic (in shares) 51,200,000 50,100,000 53,500,000
Dilutive securities-equity awards (in shares) 0 0 600,000
Weighted-average number of shares-diluted (in shares) 51,200,000 50,100,000 54,100,000
Net income (loss) per common share - basic (in dollars per share) $ (14.85) $ (4.22) $ 4.10
Net income (loss) per common share - diluted (in dollars per share) $ (14.85) $ (4.22) $ 4.06
Anti-dilutive stock awards (in shares) 3,600,000 2,800,000 1,000,000.0