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Net income (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
Mar. 31, 2024
Mar. 31, 2023
Numerator:    
Net income (loss) $ 9.0 $ (186.2)
Denominator:    
Weighted-average number of shares outstanding-basic (in shares) 52.2 50.2
Weighted-average number of shares outstanding-diluted (in shares) 52.2 50.2
Income (loss) per common share - basic (in dollars per share) $ 0.17 $ (3.71)
Income (loss) per common share - diluted (in dollars per share) $ 0.17 $ (3.71)
Anti-dilutive securities (in shares) 4.5 3.2