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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 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Numerator:                
Net income (loss) $ 114.8 $ (283.1) $ 9.0 $ (263.4) $ (261.4) $ (186.2) $ (159.3) $ (711.0)
Denominator:                
Weighted-average number of shares outstanding-basic (in shares) 53.1     51.8     52.6 50.9
Dilutive securities - equity awards (in shares) 2.5     0.0     0.0 0.0
Weighted-average number of shares outstanding-diluted (in shares) 55.6     51.8     52.6 50.9
Earnings (loss) per common share - basic (in dollars per share) $ 2.16     $ (5.08)     $ (3.03) $ (13.97)
Earnings (loss) per common share - diluted (in dollars per share) $ 2.06     $ (5.08)     $ (3.03) $ (13.97)
Anti-dilutive securities (in shares) 2.6     4.0     4.4 3.6