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Net Income/(Loss) Per Share (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Numerator (basic and diluted):        
Net income/(loss) $ (22.5) $ 12.2 $ (9.1) $ 35.6
Less: Dividends paid to participating securities (0.2) (0.2) (0.7) (0.5)
Undistributed and distributed earnings/(loss) available to common stockholders, basic (22.7) 12.0 (9.8) 35.1
Undistributed and distributed earnings/(loss) available to common stockholders, diluted $ (22.7) $ 12.0 $ (9.8) $ 35.1
Denominator:        
Average number of common shares outstanding (in shares) 52,593,900 31,046,100 38,415,900 31,022,100
Effect of dilutive stock-based compensation (in shares) 0 354,900 0 359,500
Average number of common and potential common shares outstanding (in shares) 52,593,900 31,401,000 38,415,900 31,381,600