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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, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Numerator:            
Net loss $ (283.1) $ 9.0 $ (261.4) $ (186.2) $ (274.1) $ (447.6)
Denominator:            
Weighted-average number of shares outstanding-basic (in shares) 52.6   50.7   52.4 50.5
Weighted-average number of shares outstanding-diluted (in shares) 52.6   50.7   52.4 50.5
Net loss per common share - basic (in dollars per share) $ (5.38)   $ (5.16)   $ (5.23) $ (8.86)
Net loss per common share - diluted (in dollars per share) $ (5.38)   $ (5.16)   $ (5.23) $ (8.86)
Anti-dilutive securities (in shares) 2.3   3.6   3.4 3.4