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Net Loss Per Share - Basic and Diluted Loss per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Earnings Per Share [Abstract]        
Net loss $ (70.0) $ (50.3) $ (133.4) $ (91.3)
Weighted average number of common shares outstanding, basic (in shares) 53.2 48.9 53.1 48.7
Weighted average number of common shares outstanding, diluted (in shares) 53.2 48.9 53.1 48.7
Net loss per common share - basic (in dollars per share) $ (1.32) $ (1.03) $ (2.51) $ (1.87)
Net loss per common share - diluted (in dollars per share) $ (1.32) $ (1.03) $ (2.51) $ (1.87)