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Earnings per common share - Schedule of Basic and Diluted Net Loss per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Numerator:    
Net income $ 68.0 $ 9.0
Denominator:    
Weighted-average number of shares outstanding-basic (in shares) 54.4 52.2
Dilutive securities - equity awards (in shares) 2.9 0.0
Weighted-average number of shares outstanding-diluted (in shares) 57.3 52.2
Earnings per common share - basic (in dollars per share) $ 1.25 $ 0.17
Earnings per common share - diluted (in dollars per share) $ 1.19 $ 0.17
Anti-dilutive securities (in shares) 4.0 4.5