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Earnings (loss) 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 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Numerator:            
Net income (loss) $ (12.0) $ 68.0 $ (283.1) $ 9.0 $ 56.0 $ (274.1)
Denominator:            
Weighted-average number of shares outstanding-basic (in shares) 54.2   52.6   54.3 52.4
Dilutive securities - equity awards (in shares) 0.0   0.0   2.4 0.0
Weighted-average number of shares outstanding-diluted (in shares) 54.2   52.6   56.7 52.4
Earnings (loss) per common share - basic - basic (in dollars per share) $ (0.22)   $ (5.38)   $ 1.03 $ (5.23)
Earnings (loss) per common share - basic - diluted (in dollars per share) $ (0.22)   $ (5.38)   $ 0.99 $ (5.23)
Anti-dilutive securities (in shares) 7.1   2.3   4.6 3.4