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Earnings (loss) per common share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Numerator:    
Net loss $ (183.0) $ (3.7)
Denominator:    
Weighted-average number of shares outstanding-basic (in shares) 50.2 50.7
Weighted-average number of shares outstanding-diluted (in shares) 50.2 50.7
Loss per common share - basic (in dollars per share) $ (3.65) $ (0.07)
Loss per common share - diluted (in dollars per share) $ (3.65) $ (0.07)
Anti-dilutive securities (in shares) 3.2 1.6