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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 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Numerator:                
Net loss $ (263.4) $ (261.4) $ (186.2) $ (87.1) $ (52.9) $ (4.6) $ (711.0) $ (144.6)
Denominator:                
Weighted-average number of shares outstanding-basic (in shares) 51.8     49.9     50.9 50.2
Weighted-average number of shares outstanding-diluted (in shares) 51.8     49.9     50.9 50.2
Loss per common share - basic (in dollars per share) $ (5.08) $ (5.16) $ (3.71) $ (1.75) $ (1.06) $ (0.09) $ (13.97) $ (2.88)
Loss per common share - diluted (in dollars per share) $ (5.08) $ (5.16) $ (3.71) $ (1.75) $ (1.06) $ (0.09) $ (13.97) $ (2.88)
Anti-dilutive securities (in shares) 4.0     3.3     3.6 2.6