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Loss per common share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Numerator:            
Net loss $ (261.3) $ (183.0) $ (56.4) $ (3.7) $ (444.3) $ (60.1)
Denominator:            
Weighted-average number of shares outstanding-basic (in shares) 50.7   50.0   50.5 50.3
Weighted-average number of shares outstanding-diluted (in shares) 50.7   50.0   50.5 50.3
Net loss per common share - basic (in dollars per share) $ (5.15)   $ (1.13)   $ (8.80) $ (1.19)
Net loss per common share - diluted (in dollars per share) $ (5.15)   $ (1.13)   $ (8.80) $ (1.19)
Anti-dilutive securities (in shares) 3.6   1.8   3.4 3.0